Monday

November 30, 2015
Number of results: 7,718

**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)
*April 24, 2013 by Jeannie*

**maths**

A number of circles touch each ather. The area of the smallest circle is 4n cm^2 and each consecutive circle has area 9/4 times that of the previous one. If the distance AB=665/8. Line AB passes at the centre of the circles. How many circles are there?
*March 3, 2015 by jay*

**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 ...
*August 24, 2010 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 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?
*February 12, 2013 by chirag*

**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?
*February 13, 2013 by Rox*

**maths**

Two circles with centers a and b of radii 3 cm and 4 cm res , intersecting at two points c and d such that ac and bc are two tangets of the circles, then length of common chord .
*February 17, 2015 by Phalgun*

**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 ...
*December 21, 2012 by faizel*

**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
*August 18, 2011 by JJ*

**Math (Circles)**

True or False If two circles have 4 common tangents, then the two circles intersect.
*May 29, 2013 by Sam*

**math**

Two circles have a radii of 15 and 95. If the two external tangents to the circles intersect at 60 degrees, how far apart are the centers of the circles? Can someone please explain this to me, show the work and give me the answer. Thanks!
*August 11, 2015 by logi*

**math**

Two circles have a radii of 15 and 95. If the two external tangents to the circles intersect at 60 degrees, how far apart are the centers of the circles? Can someone please explain this to me, show the work and give me the answer. Thanks!
*August 11, 2015 by logi*

**GEOMETRY**

Two circles with radii a and b touch each other externally . Let c be the radius of a circle which touches these two circles as well as their common tangent to the two circles . Then relate a,b and c through an equation
*March 15, 2015 by PRANAV*

**trig**

Two circles of radii 5 and 3 cm, respectively, intersect at two points. At either point of intersection, the tangent lines to the circles form a 60◦ angle, as in Figure 2.2.4 above. Find the distance between the centers of the circles
*November 30, 2014 by Anonymous*

**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...
*October 12, 2012 by jenny*

**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.
*April 25, 2010 by Brittany*

**math**

A number of circles touch each ather. The area of the smallest circle is 4n cm^2 and each consecutive circle has area 9/4 times that of the previous one. If the distance AB=665/8. Line AB passes at the centre of the circles. How many circles are there?
*March 4, 2015 by kamo*

**math**

A number of circles touch each ather. The area of the smallest circle is 4picm2 and each consecutive circle has area 9/4 times that of the previous one. If the distance AB=665/8. Line AB passes at the centre of the circles. How many circles are there?
*March 3, 2015 by jay*

**math**

A number of circles touch each ather. The area of the smallest circle is 4picm2 and each consecutive circle has area 9/4 times that of the previous one. If the distance AB=665/8. Line AB passes at the centre of the circles. How many circles are there?
*March 4, 2015 by jay*

**math**

A number of circles touch each ather. The area of the smallest circle is 4picm2 and each consecutive circle has area 9/4 times that of the previous one. If the distance AB=665/8. Line AB passes at the centre of the circles. How many circles are there?
*March 4, 2015 by jay*

**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 ...
*October 21, 2009 by Kelly*

**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 ...
*December 4, 2013 by Sam*

**mathematics,physics,life science,LO,afrikaans**

A number of circles are given and the area of the smallest circles is 4π.The area of the next circle is 9/4 times of the previous circle.if there are 6 circles,determine the length of the diameter of the last circle.
*March 8, 2015 by uchriciah*

**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...
*May 9, 2009 by G*

**maths-circles**

can we create a unique circle with two co-linear points
*March 10, 2013 by anoynomous*

**maths**

The points of intersection of two equal circles which cut orthogonally are (2,3) and (5,4). Then radius of each circle is?
*August 30, 2014 by pavani*

**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.
*May 8, 2013 by sunny*

**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.
*April 25, 2010 by Ella*

**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
*February 26, 2013 by Anonymous*

**math**

The lengths of the diameters of two concentric circles are 6 and 8. What is the distance between the circles?
*July 24, 2014 by john*

**Analytic Geometry**

Find the points of intersections of the circles:x^2 + y^2 - 2x -2y -2 = 0 and x^2 + y^2 + 2x + 2y -2 = 0. Draw the circles.
*August 11, 2014 by Jnr John*

**Circles 1**

if the radical axis of the circles x2+y2+2gx+2fy+c=o and 2x2+2y2+3x+8y+2c=o touches the circle x2+y2+2x-2y+1=o show that either "g"=3/4 or f=2
*January 25, 2015 by Shanu*

**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
*March 20, 2013 by anoynomous*

**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 ...
*March 25, 2013 by i need help from anyone!*

**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 ...
*February 2, 2013 by Knights*

**Circles**

2 circles have different radius touch at a point and at the point has 1 common tangent and another common tangent touching the circles at different points other than the first
*January 15, 2015 by Jeffrey*

**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.
*February 17, 2013 by Chris*

**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)
*October 15, 2011 by alya*

**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.
*December 24, 2012 by Anonymous*

**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?
*December 5, 2010 by Tyler*

**geometry**

Two circles which are not congruent touch externally. the sum of their area is 130cm.square and distance between their centers is 14 cm. find radii of circles.
*September 28, 2014 by Rohit*

**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.
*August 5, 2010 by kayle*

**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.
*December 31, 2012 by Shruti katiyar*

**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
*February 25, 2013 by Anonymous*

**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
*February 17, 2013 by Anonymous*

**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
*January 1, 2013 by anshika*

**Math...again **

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

**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!
*September 11, 2013 by Sarah*

**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
*September 14, 2013 by luckybee*

**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.
*February 18, 2011 by Diana*

**Math...anyone?**

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

**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 ...
*March 21, 2013 by Knights*

**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.
*October 7, 2009 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.
*October 14, 2009 by David*

**Mathematics**

Three circles touch each other externally. Their centres make a triangle with sides of 11cm, 15cm and 19cm. What are the radii of the three circles?
*November 3, 2015 by Christopher*

**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...
*August 21, 2011 by Ramesh Reddy*

**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?)
*April 26, 2012 by rfvv*

**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
*September 12, 2013 by Sarah*

**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
*December 10, 2013 by Liz*

**website**

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

**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?
*February 13, 2013 by KUMAR*

**Bisectors in a Triangle**

Let ABC have side lengths AB=13, AC=14, and BC=15. There are two circles located inside <BAC which are tangent to rays AB, AC , and segment BC. Compute the distance between the centers of these two circles.
*March 26, 2013 by Knights*

**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 ...
*October 19, 2009 by Kelly*

**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...
*March 16, 2013 by infinite number of circles*

**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)
*January 8, 2012 by Math's Noob*

**maths**

This taxi sign is 2.1 metres wide and 39cm tall. Assuming the ends are perfect semi-circles find the area in square metres to three significant figures -
*December 3, 2014 by lohitha*

**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?
*February 11, 2013 by ARIRIRI*

**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?
*February 12, 2013 by please help me out!!! please*

**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 ...
*January 8, 2012 by luckybee*

**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^...
*June 28, 2008 by Kelly*

**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 ...
*March 17, 2011 by Anonymous*

**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
*September 13, 2013 by lucky bee*

**Geometry**

A swimming pool is to be constructed in the space of partially overlapping identical circles. Each of the circles has a radius of 9 m, and each passes through the center of the other. Find the area of the swimming pool.
*September 28, 2014 by Carl*

**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.
*December 1, 2010 by Nat*

**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.
*October 20, 2011 by arch*

**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.
*April 14, 2011 by Bianca*

**Trigonometry**

Two circles, whose radii are 12 inches and 16 inches respectively, intersect. The angle between the tangents at either of the points of intersection is 29'30'. Find the distance between the centers of the circles.
*October 24, 2015 by Anika*

**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?
*September 16, 2010 by Dhwani*

**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 ...
*May 2, 2007 by Mrs. Cunniffe*

**GEOMETRY QUESTION**

Four circles of unit radius are drawn with centers (0,1), (-1,0), (0,1), and (0,-1). A circle with radius 2 is drawn with the origin as its center. What is the area of all points which are contained in an odd number of these 5 circles? (Express your answer in the form "a pi + ...
*November 25, 2012 by SUPER HARD*

**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?
*February 19, 2010 by rmz*

**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}
*March 15, 2013 by anoynomous*

**GEOMETRY CIRCLES PLEASE**

The diagram shows tangent circles and lines. if AB=15 CM find AC, AD and AE . Help me reiny and other tutors please<3 thank you this is the figure img19.(imageshack.)us/img19/7143/0eua.png just remove the open and close parentheses thank you
*December 4, 2013 by BARBIE LEE *

**math**

Six unit circles are arranged inside a rectangle. the circles are tangent to each other and tangent to the rectangle as they appear in the diagram. What is the area of the rectangle?
*March 8, 2015 by julie*

**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!!!
*November 15, 2012 by dss*

**math**

Square ABCD has the centers of 4 equal circles as its vertices. Find the shaded area. it like this OO OO only that the up and down circles are together and in the middle is the area to be find it's shape like a diamond
*May 19, 2012 by alandra*

**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?
*May 11, 2012 by joe*

**maths-circles**

a circle having a centre O has a triangle PQS inside it with the base QP is not on centre O. PT and QT are two tangents from an exterior point T (S, O and T are linear points - lie in one line ) it is given that angle ptq = 25 deg . find angle PSQ and OPQ
*March 15, 2013 by anoynomous*

**Math Geometry**

Four circles of unit radius are drawn with centers (1,0), (-1,0), (0,1), and (0,-1). A circle with radius 2 is drawn with the origin as its center. What is the area of all points which are contained in an odd number of these 5 circles? (Express your answer in the form "a pi + ...
*August 3, 2013 by 3.1415926...*

**MATH**

Four circles of unit radius are drawn with centers (1,0), (-1,0), (0,1), and (0,-1). A circle with radius 2 is drawn with the origin as its center. What is the area of all points which are contained in an odd number of these 5 circles? (Express your answer in the form "a pi + ...
*August 6, 2013 by 3.1415926...*

**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??
*September 14, 2009 by ggift*

**math**

Thr figure below is made up of four congruent circles Each circle is tsngent to two of the other 3 circles as shown. If the radius of each circle is 6 units, what is the area of the shaded region inthe figure below? Express your answer as adecimal to the nearest hundredth.
*June 26, 2012 by aunika*

**Math**

A walkway is formed by four semi circles. The diameter of the inner semi circles is 14 feet. The width between the outer and inner semicircles is 2 feet. Find the area of the walkway. Use 3.14 as an approximation for pi.
*June 9, 2015 by Eiyannah*

**Math**

This question is based on a project- Describe three concentric circles having a 1-inch, a 3-inch, and a 4-inch radius. Draw the diameter of the large circle.(This is also the diameter of the two smaller circles) Please I Need So Much Help. This Project Is Do Tommorrow and I ...
*February 8, 2009 by Alena*

**Math**

There is a 4 by 4 grid of points. Each pair of horizontally adjacent or vertically adjacent points are separated by a distance of 1 unit. How many circles of radius 1 pass through exactly 2 of these grid points? Justify your response. (Note: the circles must be in the plane ...
*December 5, 2010 by SkaterGirl*

**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. answer and please explain step by step how u got the answer!! please!!!!
*November 12, 2012 by dan*

**Haley**

Three circles with radii 35cm, 50cm, and 65cm respectively are tangent to each other externally. Find the angles of the triangle formed by joining the centers of the circles. My teacher said to use the cosine law cause you know 3 sides but no angles. But I can't figure it out...
*August 27, 2014 by Math*

**Geometry**

The sum of the diameters of two circles is 28 inches. One circle has a diameter that is 8 inches longer than the diameter of the other. What are the diameters of the two circles?
*January 20, 2010 by Anonymous*

**I am really struggling on this problem - geometry**

Please help guys if you can, this is a really hard problem I am trying to solve Four circles of unit radius are drawn with centers (1,0),(0,1) ,(-1,0) ,(0,-1) and . A circle with radius 2 is drawn with the origin as its center. What is the area of all points which are ...
*December 5, 2012 by Knights*

**social studies**

Can somebody help me on this? I don't know what to answer. Venn Diagram Write details that tell how the subjects are different in the outer circles. Write details that tell how the subjects are alike where the circles overlap. Subject: Squatter Settlement Subject: Migrant Camp
*October 16, 2014 by Anonymous*

**Pre-Calc (Circles). Please help :(**

Five concentric circles with radii 1, 2, 3, 4, and 5 are drawn as shown dividing the circle of radius 5 into five regions: a circle of radius 1 and 4 annuuli (rings). What is the probability that a point chosen randomly from within the circle of radius 5 lies in the annulus ...
*September 28, 2014 by J*