Question

If a circle has an area of 78.5 cm^2, what is its radius? (Show a solution.)

Answer 1

Use:

Area = pi*r^2

Answer 2

(78.5/(pi))^0.5=r

Answer 3

sqrt(78.5/pi) = Radius

Answer 4

\[\large \color{blue}{ r = \sqrt{\frac{Area}{\pi}}}\]