The ratio of the circumferences of two circles is 2 : 3. What is the ratio of their areas ?
A. 2 : 3
B. 4 : 9
C. 9 : 4
D. None of these
Answer: Option B
Solution(By Examveda Team)
$$\eqalign{ & \Rightarrow \frac{{2\pi {R_1}}}{{2\pi {R_2}}} = \frac{2}{3} \cr & \Rightarrow \frac{{{R_1}}}{{{R_2}}} = \frac{2}{3} \cr & \Rightarrow \frac{{\pi R_1^2}}{{\pi R_2^2}} = {\left( {\frac{2}{3}} \right)^2} \cr & \Rightarrow \frac{{\pi R_1^2}}{{\pi R_2^2}} = \frac{4}{9} \text{ or } 4:9 \cr} $$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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