The radius of a circle is so increased that its circumference increased by 5%. The area of the circle, then increases by

12.5%
10.25%
10.5 %
11.25%

Correct Answer: 10.25%

Explanation:

Increase in circumference of circle = 5%
∴ Increase in radius is also 5%.
Now, increase in area of circle = 2a + (a²/100) %
Where, a = increase in radius= 2 x 5 + (5 x 5)/100 % = 10.25%

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