Question

Find the radius of this circle.
A = ar2
r = [?] ft
A = 9aft?

Answer 1

A =
`\pi` . r^2

If A = 9
`\pi`ft^2

`\pi` . r^2 = 9
`\pi`ft^2

r^2 = 9ft^2

r = sqrt(9ft^2)

r = 3ft ( r>0)

Explanation: