What will be the area of a semi-circle whose perimeter is 36 cm ?
A. 154 cm2
B. 168 cm2
C. 308 cm2
D. Data inadequate
E. None of these
Answer: Option E
Solution(By Examveda Team)
Given :$$\eqalign{ & \pi R + 2R = 36 \cr & \Leftrightarrow \left( {\pi + 2} \right)R = 36 \cr & \Leftrightarrow R = \frac{{36}}{{\left( {\frac{{22}}{7} + 2} \right)}}cm \cr & \Leftrightarrow R = 7\,cm \cr} $$
Required area :
$$\eqalign{ & = \frac{{\pi {R^2}}}{2} \cr & = \left( {\frac{{22}}{7} \times \frac{{7 \times 7}}{2}} \right)c{m^2} \cr & = 77\,c{m^2} \cr} $$
Related Questions on Area
A. 15360 m2
B. 153600 m2
C. 30720 m2
D. 307200 m2
E. None of these
A. 2%
B. 2.02%
C. 4%
D. 4.04%
E. None of these
A. 16 cm
B. 18 cm
C. 24 cm
D. Data inadequate
E. None of these
The percentage increase in the area of a rectangle, if each of its sides is increased by 20% is:
A. 40%
B. 42%
C. 44%
D. 46%
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