# maths-circles

10,873 results

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)

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?

MATHS
Two circles of radii 5 cm and 12 cm are drawn, partly overlapping. Their centers are 13cm apart. Find the area common to the two circles.

Maths
Three circles of unit radii touch each other externally. They are inscribed in triangle. What will the area after leaving the area of those circles.

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 ...

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?

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?

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 .

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 ...

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

Math (Circles)
True or False If two circles have 4 common tangents, then the two circles intersect.

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!

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!

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

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

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.

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?

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?

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?

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?

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...

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 ...

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 ...

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.

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...

maths-circles
can we create a unique circle with two co-linear points

Math
Write the ratio of the number of squares to the number of circles as shown below. (Pretend I have four circles and five squares. The # will represent circles and the @ sign will represent squares.) #### @@@@@ (A)4 to 9 (B)5:4 (C)4 to 5 (D)5:9 I think the answer is D. Am i right?

math
Write the ratio of the number of squares to the number of circles as shown below. (Pretend I have four circles and five squares. The # will represent circles and the @ sign will represent squares.) #### @@@@@ (A)4 to 9 (B)5:4 (C)4 to 5 (D)5:9 I think the answer is D or B.

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.

maths
How many circles are there whose central lines on X axis and passes through origin?

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.

math
The lengths of the diameters of two concentric circles are 6 and 8. What is the distance between the circles?

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.

maths
The points of intersection of two equal circles which cut orthogonally are (2,3) and (5,4). Then radius of each circle is?

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

math-circles
The area of two circles are in a ratio of 4:9. If both radii are integers, and r(1) - r(2) = 2, what is the radius of the larger circle?

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 ...

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 ...

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

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

Maths
Three circles of radius 1 unit fit inside a square such that the two outer circles touch the middle circle and the sides of the square. Given the centres of the circle lie on the diagonal of the square, find the exact area of the square. I got the answer 18 + 8root2 but the ...

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.

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)

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

Geometry
Three circles touch one another externally.Their centres form A triangle with sides 10cm,9cm and 7cm.Find the radii of the circles

math
Two circles of radii 9cm and 13cm have their centres 15cm apart. Find the angle between the radii joining the centres to the points of intersection of the circles. Hence find the overlapping area between the two circles. - (Been struggling with this question, any help would be...

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?

geometry
Two circles which are not congruent touch externally. the sum of their area is 130¦Ðcm.square and distance between their centers is 14 cm. find radii of circles.

Math
Two identical circles are to be cut from a 12cm by 9cm sheet of paper. What is the maximum possible radius of these circles? Show that if the length of the sheet of paper is twice the breadth of the paper, then the radius of the largest circles which can be cut out is half of ...

Math of investigation
Two identical circles are to be cut from a 12cm by 9cm sheet of paper. What is the maximum possible radius of these circles? Show that if the length of the sheet of paper is twice the breadth of the paper, then the radius of the largest circles which can be cut out is half of ...

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.

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.

Math...again
Two circles have circumferences of π and 3π. What is the ratio of the area of the circles? the diameters? the radii?

math
shaline cuts out circles of diametre 5/4cm from a strip of dimensions 35/4 by 5/4cm how many full circles can she cut

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!

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

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.

Math...anyone?
Two circles have circumferences of π and 3π. What is the ratio of the area of the circles? the diameters? the radii?

math
On the sphere x^2+y^2+z^2 = 13^2, there are many great circles that intersect at (3, 4, 12). Find coordinates for the other point where these circles all intersect.

Maths
Three circles with radii 1 is circumscribed tightly in an equilateral triangle. Find the perimeter of the triangle

geometry
Two overlapping identical circles have radii of 6.17. The area of their overlapping sections is 42.7. How far apart are the centers of the circles? Answer is 6.55

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 ...

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.

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.

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.

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?

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

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

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?)

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

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

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

website
What is the website that is used to do the diagrams. Its like circles connected to circles in this diagram.

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−cƒÎ, 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?

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.

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...

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 ...

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...

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?

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 ...

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^...

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 ...

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

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)

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 -

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.

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.

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.

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.

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.

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?

maths
4 circles inscribed in a big circle of radius rcm express the radius of the large circle in terms of r

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 + ...

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?

Maths
AB is a line segment and M is its mid point. Semicircle are drawn with AM,MB and AB as diameters on the same side of line AB. A circle (O, r) is drawn so that it touches all 3 semi circles . prove that r=1/6 AB.

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

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 ...

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?

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!!!

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