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: A

Solution :

\[\because \] \[d=63\,cm\] Semi-circular shaped window's circumference             \[=\frac{1}{2}\pi d\]             \[=\frac{1}{2}\times \frac{22}{7}\times 63\]             \[=99\,cm\]