Question

Find the area of a circle with a diameter of 22 inches?

Answer 1

$R=\frac{Diameter}{2}$

then

$R=\frac{22~in}{2}$

$\boxed{R=11~in}$

now we just need to apply this formula

$S=\pi*R^2$

$S=\pi*11^2$

$\boxed{\boxed{S=121*\pi~in^2}}$

Answer 2

$d=2r\\ d=22\\ 2r=22\\ r=11\ inches\\ \\ A=\pi r^2\\ A=\pi \cdot 11^2=3,14 \cdot 121=379,94\ inch^2$