A) 16
B) 14
C) 10
D) 7
Correct Answer: D
Solution :
Let side of a square \[=x\,\,\text{cm}\] \[\therefore \] \[{{a}^{2}}=81\,\,\text{c}{{\text{m}}^{2}}\] \[\Rightarrow \] \[a=\sqrt{81}=9\,\,\text{cm}\] \[\therefore \]Perimeter of square \[=9\times 4=36\,\,\text{cm}\] Again, Perimeter of semicircle = Perimeter of square \[\therefore \] \[\pi r+2r=36\] \[\Rightarrow \] \[r\left( \frac{22}{7}+2 \right)=36\]\[\Rightarrow \]\[r\times \frac{36}{7}=36\] \[\Rightarrow \] \[r=7\,\,\text{cm}\]You need to login to perform this action.
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