Question

Sudhanshu divides a circular disc of radius $7cm$ in two equal parts. What is the perimeter of each semicircular shaped disc? (Use $\pi =\frac{22}{7})$

Answer 1

Radius of disc = $7$ $cm$

$\begin{array}{cc}\text{Perimeter of semicircular shaped disc}& =\pi r+2r\\ & =(\frac{22}{7}\times 7)+(2\times 7)\\ & =(\frac{22}{7}\times 7)+\left(14\right)\\ & =22+14\\ & =36cm\end{array}$
Therefore, the perimeter of each semicircular disc is $36cm$.