Question

A circle has a radius of r inches. The area of a circle is given by A=πr2. Identify the equation(s) that represent the radius of the circle.

Answer 1

r = √[A / π]

Explanation:

Actually, it's A = π · r² or A = πr^2.

Solving this for r, we get: r^2 = A / π, and so r = √[A / π]

Answer 2

r=pi/a^2

Explanation: