Question

Use the formula to find the length of the radius if the area is 25 square centimeters.

Round your final answer to the nearest tenth of a centimeter.
`\sqrt{(a)/(\pi )`

A circle has radius r. The area of this circle can be found using the formula

`A=\pi r^(2)`

Answer 1

Answer:r = 2.81 centimeters

Explanation:

The area of this circle can be found using the formula

A=πr^2

Where r = radius of the circle

π is a constant whose value is 3.14

We are given the area of the circle to be 25 square centimeters. To determine the length of the radius of the circle , we will make r the subject of the formula

r^2 = A/π

Taking square root of both sides of the equation,

r = √A/π

Since A = 25 and π = 3.14,

r= √25/3.14

r = 2.82166323992

Approximating to the nearest tenth of a centimeter,

r = 2.81 centimeters