Question

A circle has an area of 78.5 square inches what is the radius of the circle

Answer 1

`area = \pi * r ^(2) \\ 78.5 = 3.14 {r}^(2) \\ (78.5)/(3.14) = \frac{3.14 {r}^(2) }{3.14} \\ {r}^(2) = 25 \\ r = √(25) \\ r = 5inches`

Answer 2

Explanation:

Area of circle = 78.5 in²

πr² = 78.5

3.14*r² = 78.5

`r^(2)=(78.5)/(3.14)\\\\=(78.5*100)/(3.14*100)\\\\=(7850)/(314)\\\\r^(2)=25\\r=√(25)=√(5*5)\\\\`

r = 5 in