If the radius of a circle is increased by 6%, then the area of the circle is increased by -

3.6%

12.36%

36%

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উত্তর: 12.36%

Initial area = πr2 New radius = r + 6% of r = 1.06r So, new area = π(1.06r)2 = 1.1236πr2 So, percentage of increase in area = (1.1236πr2 - πr2) / πr2 x 100% = 12.36%

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