Thursday

April 17, 2014

April 17, 2014

Number of results: 12,321

**maths**

Are you constructing semi-circles on each of the sides of the square? If so, wouldn't the sum of those four semi-circles be the area of 2 complete circles, each with a radius of 5 cm ?
*Saturday, November 13, 2010 at 2:15am by Reiny*

**Maths**

the figure below shows 3 similar circles that just touch one another.A,Band C are the centres of the circles.If the perimeter of the triangle ABC is 42cm, what is the total area of the unshaded part of the 3 circles. (take pie = 22/7)
*Wednesday, April 24, 2013 at 3:17am by Jeannie*

**Algebra 2**

Make a table with a process column to represent each pattern. Write an expression for the number of circles in the Nth figure. The first figure is 5 circles long and 2 circles wide, the second 5 circles long and 3 circles wide. How do I complete this problem? I just need some ...
*Tuesday, August 24, 2010 at 7:41pm by Tabitha*

**maths**

Three circles, each with a radius of 10, are mutually tangent to each other. The area enclosed by the three circles can be written as a√b−cπ, where a, b and c are positive integers, and b is not divisible by a square of a prime. What is the value of a+b+c?
*Wednesday, February 13, 2013 at 11:52am by Rox*

**maths**

Three circles, each with a radius of 10, are mutually tangent to each other. The area enclosed by the three circles can be written as ab√−cπ, where a, b and c are positive integers, and b is not divisible by a square of a prime. What is the value of a+b+c?
*Tuesday, February 12, 2013 at 9:22am by chirag*

**maths**

there are two circles touching each other at one point. The radius of bigger circle is 4cm and smaller is 1cm. A small third circle is drawn which touches both the first two circles at one point each. A common tangent passes through all the three circles.Find the radius of ...
*Friday, December 21, 2012 at 7:57am by faizel*

**algebra**

You solve this by creating a Venn Diagram with 3 intersecting circles. Begin by putting the 4 where the 3 circles intersect. When you are done, add up each part of all of the circles and you should get 70. If you get less than 70 that means customers purchased none of these ...
*Tuesday, February 19, 2013 at 9:21pm by JJ*

**Math (Circles)**

True or False If two circles have 4 common tangents, then the two circles intersect.
*Wednesday, May 29, 2013 at 10:17pm by Sam*

**math**

What I have found is that counters are inch diameter circles children use to visual help count so your child has to draw circles in the boxes that correspond to the number if it says 3 the your child makes 3 circles one in each box
*Monday, January 3, 2011 at 4:10pm by Mike*

**MATHS**

two circles c1 and c2 meet at the points A and B. CD is a common tangent to these circles where C and D lie on the circumference of C1 and C2 respectively. CA is the tangent to c2 at A. When produced DB meets the circumference of C1 at p. Prove that PC is parallel to AD
*Thursday, August 18, 2011 at 6:51am by JJ*

**geometry**

There are a lot of loose ends in this explanation. You give no explanation of the relative positions of the circles, where A,B,C,D are, or even O. All you say is there are 3 circles (somewhere) and that their "center" is on line OA. (by the way, what is the "center" of 3 ...
*Friday, September 13, 2013 at 7:48pm by Steve*

**Maths**

what are "similar" circles? If you mean they have the same radius, then ABC is equilateral, with side 14, circles have radius 7. Area of ABC is 49/2 √3 Area of circular sectors included in ABC is 3 * 1/2 (40)(π/3) = 20π Dunno what's shaded or not, but that ...
*Wednesday, April 24, 2013 at 3:17am by Steve*

**geometry**

Three circles are externally tangent to one another. The radius of each of the circles is 2 cm. A belt fits tightly around the three circles. Find the length of the belt. Express your answer in terms of pi with an explanation.
*Sunday, April 25, 2010 at 10:34pm by Brittany*

**GEOMETRY QUESTION**

no actually the answer is: Solution: We want the area of the regions labeled "One Circle" and "Three Circles" (these are the odd numbers covered). We can get these by taking the area of the big circle with a radius of 2 (which is ) and then subtracting the area of "Two Circles...
*Sunday, November 25, 2012 at 3:48pm by Answer!!*

**maths**

Let ABC be a triangle in the plane. Find circles C0;C1; : : : ;C6 such that Cj has exactly j points in common with the boundary of ABC (this \boundary" consists of the line segments AB, BC, CA). Is it possible to nd a circle C7 with 7 points in common with the boundary of ABC...
*Friday, October 12, 2012 at 1:19pm by jenny*

**MATHS**

However, all the scrap pieces cannot be used to form whole circles, so, assuming a rectangular packing of the circles, only 5 discs can be fit along the length of the cardboard. The diameter of 14 cm means that only 3 can fit across. That means that only 15 discs can be cut. A...
*Sunday, December 29, 2013 at 9:43pm by Steve*

**maths-circles**

can we create a unique circle with two co-linear points
*Sunday, March 10, 2013 at 8:51am by anoynomous*

**Maths**

I assume A is the area between the 2-cm and the 3-cm circles B is the area between the 3-cm and 4-cm circles. A = pi(3^2 - 2^2) = 5pi B = pi(4^2 - 3^2) = 7pi B/A = 7/5
*Sunday, January 8, 2012 at 4:39pm by Steve*

**Geometry/Trigonometry**

Circles with centers (2,1) and (8,9) have radii 1 and 9, respectively. The equation of a common external tangent to the circles can be written in the form y=mx+b with m < 0. What is b? I drew the diagram and the tangents but to no avail. I cannot seem to find the points ...
*Wednesday, December 4, 2013 at 12:18pm by Sam*

**ALGEBRA**

Please verify and correct the typo. The question says the circles are concentric, but the equations give two circles of radii 4 and 9 which intersect each other. Would the circles be non-concentric, or one of the equations had a typo?
*Monday, September 14, 2009 at 10:24pm by MathMate*

**maths**

Please be more specific. Are we supposed to see triangles in circles with angels?
*Sunday, January 2, 2011 at 5:06am by Reiny*

**Math**

Use each of the numbers 7, 8, 9, 10, and 11 once and only once to fill in the circles so that the sum of the numbers in the three horizontal circles equals the sum of the numbers in the three vertical circles. Of the three possible solutions, which numbers can be used in the ...
*Wednesday, October 21, 2009 at 12:59pm by Kelly*

**math**

Given that a sports arena will have a 1400 meter perimeter and will have semi- circles at the ends with a possible rectangular area between the semi-circles, determine the dimensions of the rectangle and semi-circles that will maximize the total area.
*Wednesday, May 8, 2013 at 1:03am by sunny*

**maths-circles**

No, consider the line joining your two points to be a chord of the circle That chord could be the diameter of the circle or it could be near the edge of the circumference for a very large circle, thus there would be an infinite number of circles possible between these two ...
*Sunday, March 10, 2013 at 8:51am by Reiny*

**Math kindergarten**

You can use circle..make 6 circles=6 8 circles=8
*Tuesday, October 9, 2012 at 6:07pm by Anonymous*

**math**

Verify that the circles x2+y2 = 25 and (x−5)2+(y−10)2 = 50 intersect at A = (4, 3). Find the size of the acute angle formed at A by the intersecting circles. You will first have to decide what is meant by the phrase the angle formed by the intersecting circles.
*Sunday, April 25, 2010 at 7:40pm by Ella*

**GEOMETRY(CIRCLE)**

Three circles with different radii have their centers on a line. The two smaller circles are inside the largest circle, and each circle is tangent to the other two. The radius of the largest circle is 10 meters. Together the area of the two smaller circles is 68% of the area ...
*Monday, March 25, 2013 at 2:11am by i need help from anyone!*

**maths (sets)**

Use Venn diagrams Draw two intersecting circles, label one French, the other Spanish Place x in the overlap, 11-x in the non-overlapping part of the French circle and 9-x in the non-overlapping part of the Spanish circle. Put 18 outside the two circles. 11-x + x + 9-x + 18 = ...
*Monday, May 19, 2008 at 9:35am by Reiny*

**Area of Circles**

Find the total area of three circles, each with a radious of 1 1/2 feet. Let ii stand for pie Te book gives the answer as 27ii/4 aprroimately 21.195 I know the equation and can calculate the 27. A=ii (1)^2 A=ii (1.5)^2=3 3 X 3 circles =27ii I am not clear where the 4 is coming...
*Saturday, May 9, 2009 at 2:05pm by G*

**PLEASE HELP TANGENTS AND CIRCLES PROBLEM GEOMETRY**

PLEASE HELP I REALLY NEED HELP. Each of the three circles in the figure below is externally tangent to the other two, and each side of the triangle is tangent to two of the circles. If each circle has radius three, then find the perimeter of the triangle. The figure is ...
*Saturday, February 2, 2013 at 3:44pm by Knights*

**maths**

Draw a cross-section diagram of the situation. the sides of the cone would be tangent to both circles. draw radii of both circles to a side of the cone, with the right angle as they meet the side Let the remaining distance from the top of the smaller circle to the vertex of ...
*Tuesday, October 30, 2012 at 6:04am by Reiny*

**HELP-PROBLEM SOLVING IN MATHEMATICS**

a piece of wire of length 136(pai) is cut to form 8 circles. the radius of the circles differ from each other, in sequence, by 1 cm. a) find the radius,r b) find the number of complete circles that can be formed if the original length of the wire is 190(pai)
*Saturday, October 15, 2011 at 5:28am by alya*

**Trig**

Three circles with radii of 4, 5, and 6 cm, respectively, are tangent to each other externally. Find the angles of the triangle whose vertexes are the centers of the circles.
*Sunday, February 17, 2013 at 9:36pm by Chris*

**maths-circles**

ABCD is a rectangle the line through C perpendicular to AC meets AB produced at X and AD produce at Y . Prove that DBXY are concyclic
*Wednesday, March 20, 2013 at 12:37pm by anoynomous*

**maths**

Draw lines joining the centers of the circles. That is an equilateral triangle with side 10. Area of triangle is 1/2 * 5 * 5√3 = 25/2 √3 Now, the angles of the triangle are all π/3, so, since the area of a sector of a circle is a = 1/2 r^2 θ, each sector ...
*Wednesday, February 13, 2013 at 11:52am by Steve*

**Algebra**

It looks like you have it right but remember solid circles at the ends indicating that the end points are included. (if not, then you would use open circles)
*Saturday, March 22, 2008 at 7:02pm by Damon*

**Algebra**

Four circles with centers A,B,C,and D are mutually tangent. The areas of circles A,B,C, and D are 25pi, 100pi, 16pi, and 225pi respectively. How many units are in the perimeter of quadrilateral ABCD?
*Sunday, December 5, 2010 at 10:49pm by Tyler*

**geometry and combination**

On a straight line ℓ, we have an infinite sequence of circles Γn, each with radius 1/2^n, such that Γn is externally tangential to the circles Γn−1,Γn+1 and the line ℓ. Consider another infinite sequence of circles Cn, each with radius rn...
*Saturday, March 16, 2013 at 8:30am by infinite number of circles*

**geometry**

a target consists of five concentric circles, each with a radius 1 inch longer than that of the previous circle. calculate the area between the third and fourth circles from the center.
*Thursday, August 5, 2010 at 4:56pm by kayle*

**maths-Circles**

I think you have a typo. Draw a diagram where angle ABC is very small. Then AB is almost a diameter of the circle, and A and C are quite close together.
*Monday, February 25, 2013 at 7:08am by Steve*

**maths-Circles**

There are two equal chords AB and and CD of a circle whose centre is O , when produced meet at point E. prove that EB=ED and EA=EC
*Tuesday, February 26, 2013 at 1:37pm by Anonymous*

**math**

Two circles of radius 4 are tangent to the graph of y^2=4x at the point (1,2). Find the equation of these two circles.
*Wednesday, October 7, 2009 at 7:23pm by Anonymous*

**math**

Two circles of radius 4 are tangent to the graph y^2=4x at the point (1,2). Find the equations of the two circles.
*Wednesday, October 14, 2009 at 7:25pm by David*

**Math...anyone?**

Two circles have circumferences of π and 3π. What is the ratio of the area of the circles? the diameters? the radii?
*Monday, October 21, 2013 at 7:53pm by Nikki*

**Math**

circles P and Q are externally tangent at T. Horizontal lines l and m are, respectively, tangent to circles P and Q at R and S. Show that RT must contain S.
*Friday, February 18, 2011 at 8:20am by Diana*

**Math...again **

Two circles have circumferences of π and 3π. What is the ratio of the area of the circles? the diameters? the radii?
*Monday, October 21, 2013 at 7:30pm by Nikki*

**college math**

Box of all students with 2 intersecting circles in it. One circle is married students (total 12) One circle is parent homes(total 20) Intersection of circles contains 2 Outside both circles but inside box is single students living elsewhere. that is 50 -12 - 18
*Sunday, March 7, 2010 at 8:23pm by Damon*

**website**

What is the website that is used to do the diagrams. Its like circles connected to circles in this diagram.
*Friday, February 22, 2013 at 9:05pm by Celest*

**math**

make three circles which overlap. Like this: (Broken Link Removed) You three circles will be truck drivers, love, and prison. Fill in the areas.
*Sunday, October 4, 2009 at 7:24pm by bobpursley*

**Maths**

Three circles are placed on a plane in such a way that each circle just touches the other two each having a radius of 10 cm. Area of the region enclosed by them.
*Monday, December 31, 2012 at 10:59pm by Shruti katiyar*

**Maths**

Three circles are placed on a plane in such a way that each circle just touches the other two , each having a radius of 10 cm.find the area of region enclosed by them
*Sunday, February 17, 2013 at 4:43am by Anonymous*

**Math (Circles)**

False Draw a pair of intersecting circles and attempt to draw tangents, then Draw a pair of non-intersecting circles. Were you able to draw 4 tangents? I was. Take it one step further , .... What if one circle is completely contained within a larger circle ?
*Wednesday, May 29, 2013 at 10:17pm by Reiny*

**maths-Circles**

O is the centre of a circle which has two chords BA and BC with point B on the circumference of the circle.If OB bisects angle ABC,prove that AB=AC
*Monday, February 25, 2013 at 7:08am by Anonymous*

**English**

1. Make four circles on the dough with a cooking tool. 2. Cut out the circles of the dough. 3. Bake them for 10 minutes on a frying pan/ on an oven. (Are the expressions grammatical?)
*Thursday, April 26, 2012 at 5:27pm by rfvv*

**Math**

Use each of the numbers 7, 8, 9, 10, and 11 once and only once to fill in the circles so that the sum of the numbers in the three horizontal circles equals the sum of the numbers in the three vertical circles. OOO O 0 Of the three possible solutions, which numbers can be used ...
*Monday, October 19, 2009 at 1:00pm by Kelly*

**Math. I really don't get this question**

three circles are manually tangent externally. their centers form a triangle whose sides are of length 8, 9, 13. find the total area of the three circles
*Tuesday, December 10, 2013 at 9:46pm by Liz*

**calculus**

if the tangent of two intersecting circles, at their points of intersection are perpendicular, the circles are said to be orthogonal. Show that the circles x^2+y^2-6x+4y+2=0 and x^2+y^2+8x+2y-22=0 are orthogonal. find the equation of the tangent to the ellipse x^2/a^2 + y^2/b^...
*Saturday, June 28, 2008 at 9:44pm by Kelly*

**maths**

http://www.khanacademy.org/math/geometry/basic-geometry/circum_area_circles/v/circles--radius--diameter-and-circumference Watch this teaching video. Take notes; replay if needed; work it out. Then let the math tutors know the answers you come up with. Someone will then be able...
*Thursday, July 11, 2013 at 9:28am by Writeacher*

**geometry**

False. Draw two tangent circles. If one is not inside the other, then there is a tangent line that passes between the circles, touching each at the point of tangency. There are also two lines that lie outside the circles, but lean up against both of them. Those are also common...
*Tuesday, November 15, 2011 at 7:49pm by Steve*

**8th grade Math**

This four-leaf clover consists of four coplanar circles. Each circle is externally tangent to two others, as shown. The two smaller circles are congruent, and the two larger circles are congruent. A square is constructed such that each of its four vertices is also the center ...
*Thursday, March 17, 2011 at 2:18am by Anonymous*

**math gre question **

in an infinite series of circles the radius of the second circle is one half the radius of the first circle and the radius of the third circle is one half the radius of the second circle. if the first circle has a radius of one inch which of the following statements best ...
*Sunday, January 8, 2012 at 7:38pm by luckybee*

**MATH**

Three circles, each with a radius of 10, are mutually tangent to each other. The area enclosed by the three circles can be written as ab−c, where a, b and c are positive integers, and b is not divisible by a square of a prime. What is the value of a+b+c?
*Wednesday, February 13, 2013 at 12:56pm by KUMAR*

**Maths**

The radii of three concentric circles are 2cm, 3cm and 4cm Find the ratio of the shaded areas A (the second circle from the inside) and B(the outer circle) (Hint: don't substitute for pi)
*Sunday, January 8, 2012 at 4:39pm by Math's Noob*

**geometry (help steve)**

Well, a unit circle externally tangent to the central unit circle subtends a central angle of 60. Draw a diagram to see that the tangents from the center to the external circles form angles of 30 each. So, if there are 4 external circles, they cover 240. Since there are 360...
*Monday, June 24, 2013 at 10:49am by Steve*

**geometry**

Three circles, each with a radius of 10, are mutually tangent to each other. The area enclosed by the three circles can be written as ab√−cπ, where a, b and c are positive integers, and b is not divisible by a square of a prime. What is the value of a+b+c?
*Monday, February 11, 2013 at 1:24am by ARIRIRI*

**Math**

Draw three circles, with 1, 3 and 4 inch radius, that all have the same center. It should look like a bulls-eye pattern. Then draw a horizontal line through the center that goes all the way across the largest circle. If you are supposed to actually draw the figure, it will ...
*Sunday, February 8, 2009 at 4:28pm by drwls*

**Geometry - Circles and tangents**

Two circles of radius 1 are externally tangent at Q . Let PQ and QR be diameters of the two circles. From P a tangent is drawn to the circle with diameter QR , and from R a parallel tangent is drawn to the circle with diameter PQ . Find the distance between these two tangent ...
*Thursday, March 21, 2013 at 5:07pm by Knights*

**MATH HOMEWORK**

Find the circle circumference and circle area with a circles radius 10 inches I think the circles are is 314 but don't know the circumference.
*Wednesday, December 1, 2010 at 9:36pm by Nat*

**Algebra**

The radii of the circles are 5, 10, 4 and 15. If they can be arranged to be mutually tangent, the quadrilateral ABCD connects the centers of the circles, and has perimeter = 2(4 + 5 + 10 + 15) = 68
*Sunday, December 5, 2010 at 10:49pm by drwls*

**AP Calculus**

Two circles of radius 4 are tangent to the graph of y^2=4x at the point (1,2). Find equations of these two circles. I found the derivative of y^2=4x, but i don't know what to do next!
*Wednesday, September 11, 2013 at 5:21pm by Sarah*

**math**

5/12 = color 5 circles 1/3 = 4/12 1/6 = ? How many circles should you color green? I'll be glad to check your answer.
*Monday, May 2, 2011 at 6:32pm by Ms. Sue*

**MATH**

the small circles intersect in lens-shaped areas of pi/2 - 1 each small circle has area pi The large circle has area 4pi The points in the lenses and the large circle outside the small circles lie in 1 or 3 circles. 4pi - 4(pi) + 4(pi/2-1) = 2pi-4
*Tuesday, August 6, 2013 at 3:28pm by Steve*

**Math**

The perimeter of the figure is 4 half circles, or 2 complete circles. A full circle has a perimeter of 2πr. So we have 4πr=87 yds Solve for r and hence the area of the square.
*Wednesday, April 25, 2012 at 8:40pm by MathMate*

**math-complex numbers**

all are circles of radius 2, with center at various numbers. |z-c| = r has center at c. |z|^2 = x^2+y^2 That's why the curves are circles.
*Wednesday, October 9, 2013 at 9:34pm by Steve*

**maths-Circles**

This is clearly wrong. Suppose CD is a diameter of the circle and AB is any other chord. Then ED is the shortest distance from E to any point on the circle. ED≠EB
*Tuesday, February 26, 2013 at 1:37pm by Steve*

**Math**

I have a venn diagram with two circles and some numbers floating outside of the circles. The question is add the missing labels. What does that mean? place the numbers that are floating inside the circle?
*Thursday, September 16, 2010 at 6:43pm by Dhwani*

**maths**

AB=36 cm and M is the mid-point of AB. Semicircles are drawn on AB,AM and Mb as diametrs.A circle with centre C touches all the three circles. Find the area of the shaded region.
*Monday, December 24, 2012 at 1:47pm by Anonymous*

**statistics**

let the percentage taking the prob course be x then the percentage taking the bus course is x+16 make a Venn diagram, showing two intersecting circles within a rectangle. place 14 outside the circles in the rectangle, place 24 in the intersection of the circles x + x+16 - 24...
*Thursday, December 8, 2011 at 11:46am by Reiny*

**Maths**

I am very greatefull to you if you guide me to solve this problem. Two circles touch externally. The sum of their areas is 130π cm2 and the distance between their centers is 14 cm. find the radii of the circles? I tried to solve this problem like this: Area of the circle...
*Sunday, August 21, 2011 at 12:40am by Ramesh Reddy*

**geometry**

Each of the three circles have a radius of 10. The line OA contains the center of the three circles, and the line OB is tangent to the right-hand circle. Find the length of segment CD
*Friday, September 13, 2013 at 7:48pm by lucky bee*

**geometry**

We assume the y-axis to be the common chord, i.e. the centres of the circles are at (-r/2,0) and (r/2,0). The two circles will therefore respectively be: (x+r/2)²+y²=r² (x≤0) and (x-r/2)²+y²=r² (x≥0)
*Tuesday, February 1, 2011 at 2:32am by MathMate*

**math**

the center of three congruent small circles are collinear, and their diameters form the diameter of the large circle, shown, whose area is 81 pi units. what is the circumference of one of the smaller circles? express your answer in simplest radical form.
*Thursday, October 20, 2011 at 7:28am by arch*

**Statistics/probability**

P(F or L) =P(F) + P(L) - P(F and L) = 60/120 + 50/120 - 20/120 = 90/120 = 3/4 or you could make Venn diagrams showing overlapping circles for French and Latin within a universal set of 120 enter 20 in the intersection of the two circles. then 40 would go in the non-overlapping...
*Thursday, March 19, 2009 at 11:19am by Reiny*

**maths pleaaaase**

The point X and Y are 8cm apart Draw a scale drawing of the diagram and draw the locus of points that are equidistant from both points X and Y what do they mean by equidistant Equidistant means the same distance. I'm not a teacher, but I would imagine that all points ...
*Wednesday, May 2, 2007 at 1:02am by Mrs. Cunniffe*

**maths**

two circles of radii 10 cm and 17 cm intersect at two points and distance between their centers is 21 cm.find length of common chord
*Tuesday, January 1, 2013 at 8:16am by anshika*

**Math**

Garden Area Problem. A designer created a garden from two concentric circles whose equations are as follows: (x+2)^2+(y-6)^2=16 and (x+2)^2+(y-6)^2=81 The area between the circles will be covered with grass. What is the area of that section? How do you do this?
*Friday, February 19, 2010 at 5:39pm by rmz*

**math**

Visualize a can, cut off the circles at the top and bottom, and cut open the remaining "sleeve". Don't you now have 1 rectangle and 2 equal circles? Find the areas of each and add them up (hint: the length of the rectangle is the circumference of the circle)
*Thursday, October 29, 2009 at 10:14pm by Reiny*

**geometry!!!!!!!!!!**

Three circles, each with a radius of 10, are mutually tangent to each other. The area enclosed by the three circles can be written as ab√−cπ, where a, b and c are positive integers, and b is not divisible by a square of a prime. What is the value of a+b+c?
*Tuesday, February 12, 2013 at 11:45am by please help me out!!! please*

**maths-circles**

a circle with centre O, secants AB and EF intersect each other at point C in the exterior of the circle . prove that measure of angle ACE=(1/2)*{measure of arcAE)-measure of arc BF}
*Friday, March 15, 2013 at 3:35pm by anoynomous*

**math URGENT!!!!!!**

a 12x12-inch square is divided into n^2 congruent squares by equally spaced lines parallel to its sides. circles are inscribed in each of the squares. find the sum of the areas of the circles... please answer and explain how you got this answer!!!
*Thursday, November 15, 2012 at 10:19pm by dss*

**Radius Question Geometry(college level)**

I'm not sure if there is a given figure for this problem, but if the three separate circles are tangent with the other with their centers aligned (or can be connected by a straight line), then yes, you get 60 cm for the diameter of the new, bigger circle which circumscribes on...
*Saturday, September 14, 2013 at 8:21am by Jai*

**Radius Question Geometry(college level)**

When you have 3 separate circles and the radius of each of those circles is 10 do i calculate like this? 2(10)+2(10)+2(10)=60 cm for my diameter
*Saturday, September 14, 2013 at 8:21am by luckybee*

**Geometry**

so the semicircles have a radius of 2 feet, and the 4 semicircles would be the same as 2 complete circles. total area = square + 2 circles = 16 + 2(π(2^2)) = 16 + 8π
*Wednesday, June 15, 2011 at 11:08pm by Reiny*

**Math help please**

four semicircles is really 2 full circles So the area would be the square plus 2 circles. Area = 36 + pi(3)^2 = 64.26 or 64 cm^2 to the nearest whole number The circumference would simply be the sum of the arcs of the four semicircles or the circumference of two circles C = 2(...
*Thursday, May 22, 2008 at 10:29pm by Reiny*

**MATH HELP PLEASE**

When comparing similar figures (eg. circles with circles, squares with squares, etc.) Ratio of area = (ratio of linear dimension)² In this case, ratio of diameters=2/1=2 Can you find the ratio of areas?
*Monday, September 26, 2011 at 7:51pm by MathMate*

**Math. Help me please!**

The two circles have equations x^ + (y-3)^2 = 49 and x^2 + (y-17)^2 =49. find the equation of the larger circle. The diagram looks like two circles on top of the other then a large circle outside.
*Thursday, April 14, 2011 at 6:23pm by Bianca*

**math**

When Ms. Jackson told her students that the circumference of a circle divided by the diameter of the circle is , Jarrod asked how this could be true for all circles. Of the following, which provides the best basis for explaining why this is true for all circles?
*Friday, May 11, 2012 at 11:55am by joe*

**AP Calculus**

I asked this yesterday and someone answered. but i didn't understand the explanation.. Two circles of radius 4 are tangent to the graph of y^2=4x at the point (1,2). Find equations of these two circles. I got (x-1)^2+(y-2)^2=16 and (x-4.36)^2+(y+1.36)^2=16
*Thursday, September 12, 2013 at 4:53pm by Sarah*

**Math. I really don't get this question**

If the radii of the circles are x,y,z then each side of the triangle is the sum of two of the radii. So, x+y=8 x+z=9 y+z=13 (x,y,z) = (2,6,7) Since the area of a circle is πr^2, the area of all of the circles is π(2^2+6^2+7^2) = 89π
*Tuesday, December 10, 2013 at 9:46pm by Steve*

**ALGEBRA**

The GARDEN AREA PROBLEM: A designer created a garden from two concentric circles whose equations are as follows: (x+2)2 + (y-6)2 = 16 and (x+2)2 + (y+6)2= 81 The area of the two circles will be covered with grass. What is the area of that section??
*Monday, September 14, 2009 at 10:24pm by ggift*

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