question_answer

A semi - circular shaped window has diameter of 63 cm. Its perimeter equals \[\left( \text{Use}\,\,\pi =\frac{22}{7} \right)\]

A)  99 cm 

B)  162 cm

C)  198 cm

D)  251 cm

Correct Answer: B

Solution :

\[\because d=63\,\,cm\] Semi-circular shaped window's circumference \[=\pi r+d=\frac{22}{7}\times \frac{63}{2}+63\] =99 + 63= 162 cm