If the radius of a circle is increased by 50 per cent. Its area is increased by: (A) 125 per cent (B) 100 per cent (C) 75 per cent (D) 50 per cent

1 Answer

Answer :

Answer: A

Area of circle = pie * Radius *Radius.

Suppose radius is 100

Hence Area= 3.14 *100 *100 =31400

Radius increase by 50% i.e 150

Therefore Area = 3.14 *150 *150 =70650

which is 125 % of original

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