Mensuration · Question 14 · Hard
If the radius of a circle is increased by 10%, by what percentage does its area increase?
- 11%
- 10%
- 21%
- 20%
Answer and explanation
Answer: C. 21%
Explanation: Area ∝ r², so the new area = 1.1² = 1.21 times the old area, an increase of 21%.
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