A) 88 sq cm
B) 77 sq cm
C) 99 sq cm
D) 66 sq cm
Correct Answer: B
Solution :
Perimeter of semi- circle \[\,\,\,\,\,\,\,\,=\pi R+2R=36\,\,cm\] \[\Rightarrow \] \[R\left( \frac{22}{7}+2 \right)=36\] \[\Rightarrow \,\] \[R\times \frac{36}{7}=36\] \[\therefore \] \[R=7\,\,cm\] \[\therefore \] Area of semicircle\[=\frac{1}{2}\times \pi {{R}^{2}}\] \[\,=\frac{1}{2}\times \frac{22}{7}\times 7\times 7=77\]sq cmYou need to login to perform this action.
You will be redirected in
3 sec