# geometry

If a circle has an area of 25 pi cm squared, find the circumference of the circle?
a. 5 squared cm
b. 10 squared cm
c. 50 sqaurred cm
d. 156.25 squared cm

1. 👍
2. 👎
3. 👁
1. a=pi*r^2
25pi = pi*r^2
25 = r^2
r = 5

so, c = 2pi*r = 10pi

1. 👍
2. 👎

## Similar Questions

1. ### Math.

1. Find the area of the given circle. Round to the nearest tenth. *theres a picture of a circle and the radius is 3.5* A. 22.0 cm *squared* B.38.5 cm *squared* C. 11.0 cm *squared* D. 42.8 cm *squared* 2.Find the circumference of

2. ### Calculus

A piece of wire 40cm long is cut into two pieces. One piece is bent into the shape of a square and the other is bent into the shape of a circle. How should the wire be cut so that the total area enclosed is a) a maximum? /b) a

3. ### Mathematics

1. Find the circumference of the given circle. Round to the nearest tenth. (Circle with radius of 3.5 cm) -22.0 cm -38.5 cm -11.0 cm -42.8 cm 2. Find the area of the given circle. Round to the nearest tenth. (Circle with a

4. ### Math

Circumference and Area of a Circle Quiz Part 1 1) Find the Area of the parallelogram (1pt) base:67 hight:52 A)3,302 ft2 B)3,484 ft2****** C)3,752 D)4,020 2)Find the Area of the triangle (1pt) base:2.8cm hight:7.8cm A)21.84 cm2

1. ### MATH

Find the circumference for the circle ( use 3.14 for pi ). Round to the nearest tenth. the circumference for the circle is 23 yd.

2. ### Geometry

Find the circumference and area of a circle with radius 8 cm. Express your answer in terms of π.

3. ### Math

So my question is find the circumference of the circle in terms of Pi then use the approximation 3.14 for pi and approximate the circumference. How would I do this? The radius of the circle is 2m.

4. ### Math

For any circle, which ratio is equal to the number π? Select all that apply. ***A. Circumference ------------------- Diameter B. Circumference ------------------- Radius ***C. Circumference ------------------- 2 Times Radius D.

1. ### Math

The area of a circle is given by the expression pi(16x^2 - 40x + 25) . a) What is the diameter of the circle? b) What is its circumference?

2. ### Math

Circumference and area of a circle quiz 2 | connexus |. The diameter of a tire is 2.5 feet use this measurement to answer parts A and B. Show all work to receive full credit. a. Find the circumference of the tire. b. About how

3. ### Geometry

A circle with a radius of 1/2 ft is dilated by a scale factor of 8. Which statements about the new circle are true? Check all that apply. A.The length of the new radius will be 4 feet. B.The length of the new radius will be 32

4. ### Math

Find the radius of a circle so that it's area and circumference have the same value.