Question

Find the area and the perimeter of a semi-circle of radius 7 cm.

Answer 1

Dear Student,
Here is the solution of your asked query:
$$\begin{gathered} \mathrm{Radius}\mathrm{of}\mathrm{semicircle};\mathrm{r}=7\mathrm{cm} \\ \mathrm{So}\mathrm{area}\mathrm{of}\mathrm{semi}\mathrm{circle}=\frac{{\mathrm{\pi r}}^2}{2}=\frac{1}{2}\times \frac{22}{7}\times 7\times 7=77{\mathrm{cm}}^2 \\ \mathrm{And}\mathrm{perimeter}\mathrm{of}\mathrm{semi}\mathrm{circle}=\mathrm{\pi r}+\mathrm{diameter}\mathrm{of}\mathrm{semi}\mathrm{circle}=\frac{22}{7}\times 7+2\times 7=22+14=36\mathrm{cm} \end{gathered}$$
Regards