## Prealgebra (7th Edition)

Circumference = 50$\pi$ ft The approximation of the circumference = 157 $ft^{2}$
Circumference =$\pi$ $\times$ diameter= $\pi$ $\times$ d Circumference = $\pi$ $\times$ 50 = 50$\pi$ ft The approximation of the circumference = 50$\times$ 3.14 = 157 $ft^{2}$