Question

What is the area of the following circle? D = 8

Answer 1

if the diameter is 8 units, then the radius is half that or 4.

$\bf \textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\ \cline{1-1} r=4 \end{cases}\implies A=\pi 4^2\implies A=16\pi \implies A\approx 50.27$