Question

IF THE CIRCUMFERENCE OF A CIRCLE IS 16PI CM,THEN WHAT IS ITS AREA?

Answer 1

Let r = radius of the circle
$$\begin{gathered} circumference=16\mathrm{\pi }\mathrm{cm} \\ \Rightarrow 2\mathrm{\pi r}=16\mathrm{\pi } \\ \Rightarrow \mathrm{r}=\frac{16}{2}=8\mathrm{cm} \\ \mathrm{area}=\mathrm{\pi }{\mathrm{r}}^2=\mathrm{\pi }(8{)}^2=64\mathrm{\pi }{\mathrm{cm}}^2 \end{gathered}$$