Question

If the radius of a circle is increased by 30%, by what percentage will the area increase?​

Answer 1

Step-by-step explanation:

The new radius is 1.3r, so the new area is pi times 1.69r^2, so the percentage of increase in the area is 69%. The circumference of the circle is increased by 30%, and its area is increased by (1.3²-1²)×100 = 69%.

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Answer 2

The new radius is 1.3r, so the new area is pi times 1.69r^2, so the percentage of increase in the area is 69%.