Question

A circular picture is 8 inches in diameter.
What is the area of the picture in square inches?

Answer 1

area is $\pi r^{2}$
so
$diameter/2=r$
$8/2=4$
$r=4$
$\pi (4)^{2}$
$16 \pi$
$area = 50.2654824574$
Round if it asks. 
$area = 50.3 in^{2}$