Question

The circumference of a circle is equal to its area. Find its radius.

Answer 1

Circumference of a circle $=2\mathrm{\pi r}$

Area of circle $={\mathrm{\pi r}}^2$

Given circumference of a circle is equal to its area.

$$\begin{gathered} 2\mathrm{\pi r}={\mathrm{\pi r}}^2 \\ \mathrm{r}=2 \end{gathered}$$