Question

A gardener wants to fence a semi circular garden of radius 7 m. Find the perimeter of semi circular garden. Also find the cost of fencing the garden if it costs Rs4 per metre.

Answer 1

$$\begin{gathered} \mathrm{Radius}\mathrm{of}\mathrm{the}\mathrm{semi}-\mathrm{circular}\mathrm{garden},\mathrm{r}=7\mathrm{m} \\ \mathrm{Perimeter}\mathrm{of}\mathrm{semi}-\mathrm{circular}\mathrm{garden}=\mathrm{\pi r}+2\mathrm{r} \\ =\frac{22}{7}\times 7+2\times 7 \\ =22+14 \\ =36\mathrm{m} \\ \mathrm{Cost}\mathrm{of}\mathrm{fencing}1\mathrm{m}\mathrm{of}\mathrm{the}\mathrm{garden}=\mathrm{Rs}4 \\ \mathrm{Cost}\mathrm{of}\mathrm{fencing}36\mathrm{m}\mathrm{of}\mathrm{the}\mathrm{garden}=4\times 36=\mathrm{Rs}144 \end{gathered}$$