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