Volume and surface area - Quantitative Aptitude (MCQ) questions for Q. 116

Q.  Radius of a circle is increased by 6%, determine the increase in area of the circle.
- Published on 15 Jun 15

a. 12%
b. 12.36%
c. 12.64%
d. 6%

ANSWER: 12.36%
 
Let old radius be 1r

As the radius has increased by 6%, the new radius = 1.06 r

New area = π (1.06r)2
=1.1236πr2

Increase: πr2 (1.1236) - πr2

=> 0.1236πr2 /πr2

=> 12.36%

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