## Prealgebra (7th Edition)

$C=22\pi\approx 22\times3.14=69.08$ square in.
The circumference of a circle can be calculated as: $C=2r\pi=d\pi$ where r is the radius and d is the diameter. Here: $d=22$ in $C=22\pi\approx 22\times3.14=69.08$ square in.