Step-by-step solutions to hundreds of high school circles problems.

Recent questions in Circles

2022-05-13

2022-05-05

Circle P is dilated by a scale factor of 1.5 to create circle P'. The circumference of circle P is x units.
Problem
What is the circumference in units of circle P'?

2022-03-30

Complete the square to transform the general equation below to standard form in order to determine the center and radius

2022-03-27 Answered

What is an equation of the line that passes through the point (−1,4) and is parallel to the line 2x+y=1?

2022-03-15 Answered

f(x) = (x + 4)(2x + 1)

Gary Johnson 2022-03-03 Answered

Find the area for the following circles. Leave your answers in terms of $π$ .

Alexandria Dodd 2022-03-03 Answered

Find the similarity ratio of two circles with areas $75 π c m^{2} and 27 π c m^{2}$ .

Potherat8mi 2022-03-03 Answered

Two circles are concentric. Two arcs are formed by the same central angle, with arc lengths of 54 and 81 respectively. Which of the following are possible radii for the circles? so there are two possible answers.
- 14 and 41
- 23 and 32
- 32 and 64
- 40 and 60
- 12 and 18
I believe 12 and 18 are one.

Sarah-Louise Prince 2022-03-03 Answered

Find the equation of a circle whose center is at (4, 1) and tangent to the circle $x^{2} + y^{2} - 8 x - 6 y + 9 = 0$ . Draw the circles.

cindakayumn 2022-03-03 Answered

Select from the following two-variable quadratic equations those which are equations of circles. Determine the center and the radius of the circles.
a. $x^{2} + y^{2} + 6 x - 4 y + 4 = 0$
b. $x^{2} + y^{2} + 2 x y + 5 x - 3 y - 5 = 0$
c. $x^{2} + y^{2} - 10 x + 6 y + 35 = 0$
d. $- 2 x^{2} - 2 y^{2} + 4 x + 8 y + 22 = 0$

Kelsea Ferry 2022-03-03 Answered

Three circles with centers A, B and C have respective radii 40, 30 and 20 in. and are tangent to each other externally. Find the perimeter of the curvilinear triangle formed by the three circles.
Select one:
a) 94 in
b) 88 in
c) 127 in
d) 134 in

Ausanioyck 2022-03-03 Answered

Find all the intersection points of the following two circles:
- The center circle (0,0) And its radius $\sqrt{13} $
- The center circle (1, -1) And its radius $\sqrt{17}$
(Note: Write the answer as follows $(x_{1}, y_{1}) (x_{2} , y_{2} ))$

Rupert Albert 2022-03-03 Answered

Circles A. B, and C cach have raditus 1. Circles A and B share one point of tangency. Circle C has a point of tangency with the midpoint of $\overset{―}{A B}$ . What is the area inside circle C but outside circle A and circle B?

a) $3 - \frac{π}{2}$
b) $\frac{π}{2}$
c) 2
d) $\frac{3 π}{4}$
e) $1 + \frac{π}{2}$

Mark Johns 2022-03-03 Answered

Round answers to the nearest 2 decimal places.
Find the total circumference of the circles.

enfocarteu7z 2022-03-03 Answered

Tell whether the red arcs are congruent. Explain why or why not.

a) The arcs are not congruent because the arcs are not adjacent.
b) The arcs are not congruent because they are in two different circles.
c) The arcs are congruent because arcs with the same measure are congruent
d) The arcs are congruent because they have the same measure and are in congruent circles.

tumahimikgjr 2022-03-03 Answered

The circumference of two circles are $12 π$ and $36 π$ . Find the ratio of the areas of the circles.
a) $1 : 3$
b) $1 : 9$
c) $3 : 4$
d) $2 : 5$

Potherat8mi 2022-03-03 Answered

For the three concentric circles shown below, the length of the radius of circle B is twice the length of the radius of circle A. The length of the radius of circle C is three times the length of the radius of circle A. Which of the concentric circles is a locus of points equidistant from the other two circles?
a) Circle A
b) Circle B
d) Circle C

Phoebe Xiong 2022-03-03 Answered

Take a sphere and draw on it a great circle (a great circle is a circle whose centre is the centre of the sphere). There are two regions created. Here, I am referring to regions on the surface of the sphere. Now draw another great circle: there are four regions. Now draw a third, not passing through the points of intersection of the first two. How many regions?
Here's the general question: How many regions are created by n great circles, no three concurrent, drawn on the surface of the sphere?

Kris Patton 2022-03-03 Answered

The radii of two circle are 19 cm amd 9 cm respectively. Find the radius of the circle which has circumference equal to the sum of the circumference of the two circles.

Emmanuella Browne 2022-03-03 Answered

Two circles have a scale factor of $3 : 2$ . What is the ratio of the areas of these circles?
a) $3 : 2$
b) $9 : 4$
c) $12 : 26$
d) $13 : 12$

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