Friday
August 29, 2014

# Search: maths-circles

Number of results: 6,235

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
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

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
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

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

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

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
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

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

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

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

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
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

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

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 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

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

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

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-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

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

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

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ã−cÎ, 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

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?

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

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

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

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

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-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 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

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 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 ð, 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
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

Physics
The motion of material particles in P-waves is A. Clockwise circles as seen from the side B. Counter-clockwise circles as seen from the side C. Parallel to the propagation direction D. Perpendicular to the propagation direction
November 17, 2010 by Bethany

Math/Geometry
Two circles of radius r1 and r2 are extenally tangential to each other and are also externally tangential to a staight line l. Another circle of some unknown radius is externally tangential to both the circles and to the straight line l. Find the adius of that circle.
March 13, 2013 by abcd

Math
A Target consists of three concentric circles with the same center. The radii of the circles have lengths of 3 inches, 7 inches and 9 inches. The 7 inch radii spacing is shaded. (To the nearest percent,) What percent of the target is shaded?
November 16, 2012 by LP

Geometry
I have a picture of a window showing a square in the center with sides measuring 4 feet, over each side of the square is a semi-circle(a total of 4 semi-circles), how can I find the area of the window? Should I find the area of the square and the semi-circles and add them ...
June 15, 2011 by Phillip

math
The Venn diagram below shows the dinner orders for a local restaurant. How many people did NOT order steak for dinner? Steak, chicken & fish were order. In the Venn circles, the total that did not order steak was 56. There is 43 in the right lower corner of the rectangle that ...
January 6, 2012 by Jane

algebra
How do i compute the track of two circles one with a diameter of 100 feet, the other with a diameter of 200 feet? The question asks me to compute the length of the track with these two circles touching each other at a single point.
June 2, 2010 by Rachael

Maths
A circle C has center at the origin and radius 9. Another circle K has a diameter with one end at the origin and the other end at the point (0,17). The circles C and K intersect in two points. Let P be the point of intersection of C and K which lies in the first quadrant. Let...
February 5, 2010 by Salman

diameter
if 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 24, 2011 by seth

1.An isosceles triangle with each leg measuring 13 cm is inscribed in a circle . if the altitude to the base is 12 cm find the radius of the circle 2. Circles a and b are tangent at point c. p is on circle a and q is on circle b such that pq is tangent to both circles. Given ...
December 7, 2013 by BARBIE LEE

Math
The Venn diagram below shows the dinner orders for a local restaurant. This was submitted before, but no one answered. Thanks! How many people did NOT order steak for dinner? Steak, chicken & fish were order. In the Venn circles, the total that did not order steak was 56. ...
January 7, 2012 by Jane

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 find a circle C7 with 7 points in common with the boundary of ABC?
October 10, 2012 by jenny

Math
The problem is two circles that each circle has 4 sections. One cirlce is completely shaded and the other circle has 3 of the four sections shaded. There are a total of 8 sections between the two circles and 7 of the sections are shaded in. So would the fraction be 7/8? The ...
October 17, 2009 by Anonymous

Reiny: Set Theory
School counselor posted the following data after having had 150 students sign up for electives: Art - 65 students Band - 70 students Theatre - 50 students Not all students signed up for an elective.Show the data using Venn Diagrams. Shown with problem: three intersecting ...
April 10, 2013 by Rosemary

math
darla designed a stained glass window that incorporates 20 squares, triangles, and circles altoghether. the window has 2 more triangles than twice the number of squares. the number of circles in the window is a multiple of three. how many of each shape appears in darla's ...
March 29, 2010 by bessie

Math
Make a complete re search project on maths is interconnected with other subject i.e. Maths Vs computer using art with maths.
June 5, 2012 by Shivansh Tomar

maths letaracy,history,geography and life science
im going to grade 10 next year,and i want to be a psychologist and im going for maths letaracy and history feild im realy not good with maths and i just found out a few weeks ago that i need pure maths to do psychology.i dont know what to do now ,i also dont know the jobs ...
October 26, 2013 by khanyisa maringa

Geometry
A circle of radius 1 is drawn in the plane. Four non-overlapping circles each of radius 1, are drawn (externally) tangential to the original circle. An angle ã is chosen uniformly at random in the interval [0,2ð). The probability that a half ray drawn from the centre of the ...
April 20, 2013 by Anonymous

HELP ME PLEASE. 1.An isosceles triangle with each leg measuring 13 cm is inscribed in a circle . if the altitude to the base is 12 cm find the radius of the circle 2. Circles a and b are tangent at point c. p is on circle a and q is on circle b such that pq is tangent to both...
December 8, 2013 by BARBIE LEE

Math
Truth tables are related to Euler circles. Arguments in the form of Euler circles can be translated into statements using the basic connectives and the negation as follows: Let p be gthe object belongs to set Ah. Let q be gthe object belongs to set Bh All A is B is ...
April 26, 2010 by Deb

math
Truth tables are related to Euler circles. Arguments in the form of Euler circles can be translated into statements using the basic connectives and the negation as follows: Let p be gthe object belongs to set Ah. Let q be gthe object belongs to set Bh All A is B is ...
April 27, 2010 by Deb

English
Flip the coin. If you get heads, move one space/step/circle forward. If you get tails, move two spaces/steps/circles forward. -There are circles on the board. In each circle, there is an expression or a piccture.- (Are they correct? By the way, which side is heads and which ...
June 13, 2010 by rfvv

Physics
The equipotential lines inside a parallel plate capacitor a) circles clockwise b)circles counterclockwise c)radiates inwards d)radiates outwards e)runs parallel to capacitor plates f)runs perpendicular to capacitor plates I have narrowed it down to either e) or f) but I think ...
April 4, 2008 by Andrea