Question

A diameter of a circle is 78 cm
WHat is the area

Answer 1

since it has a diameter of 78, then its radius is half that, or 39.

`\textit{area of a circle}\\\\ A=\pi r^2 ~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=39 \end{cases}\implies A=\pi (39)^2\implies A\approx 4778.36~cm^2`