Solution
Let radius = 10 cm
=> Area of circle = $$\pi (10)^2 = 100 \pi$$ sq. cm
If radius is increased by 29%, => New radius = 12.9 cm
New area = $$\pi (12.9)^2 = 166.41 \pi$$ sq. cm
=> % increase in area = $$\frac{166.41 - 100}{100} \times 100$$
= 66.41 %
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