Paper 1 · Mathematical Reasoning and Aptitude
The radius of a circle increases by 20%. By what percentage does the circumference increase?
A20% ✓ Correct
B40%
C44%
D48%
Correct answer: (A) 20% — The circumference increases by 20%, so that is the answer.
Explanation
★The circumference increases by 20%, so that is the answer.
★The circumference of a circle is directly proportional to its radius.
★So if the radius rises by a certain percentage, the circumference rises by the same percentage.
★The radius here rises by 20 per cent.
★So the circumference also rises by 20 per cent.
★So the circumference increases by 20%.
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