2016 · Q52
If the radius of a circle is reduced by 50%, its area will be reduced by
General Mental Ability, Quantitative Aptitude and StatisticsNumber system and arithmetic
- A30%
- B50%
- C60%
- D75%
Explanation
Area = πr². Halving the radius gives π(r/2)² = πr²/4 — one quarter of the original area, i.e. a reduction of 3/4 = 75%. Hence (D).