Answer:
r = +(8 ft) / (√π)
Step-by-step explanation:
Formula for the area of a circle: A = πr²
Here, 64 ft^2 = πr²
Solving for r², we get
64 ft^2
r² = ---------------
π
so that r is the positive square root of this expression:
64 ft^2
r = +sqrt ( -------------- )
π
= +(8 ft) / (√π)
