Arithmetic Ability
Area

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Q.

If the radius of a circle is decreased by 50%, find the percentage decrease in its area.

View Answer

Correct choice: C

Explanation:

Let original radius = R. New radius = 50100R = 50100R Original area =R2 and new area = πR2 3πR24*1πR2*100 Decrease in area = π(R2)2=πR24 = 75%
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