1. If the radius of a circle is increased by 25%, its area increases by:
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By: anil on 05 May 2019 02.15 am
Let radius = 10 cm => Area of circle = $$pi (10)^2 = 100 pi$$ sq. cm If radius is increased by 25%, => New radius = $$10 + frac{25}{100} imes 10 = 12.5$$ cm New area = $$pi (12.5)^2 = 156.25 pi$$ sq. cm => % increase in area = $$frac{156.25 - 100}{100} imes 100$$ = 56.25% => Ans - (D)
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