If the diameters of a circle is increased by 100% . Its area is increased by?
Options:
A . 300%
B . 400%
C . 100%
D . 200%
Answer: Option A
Original area = ?(d/2)2= (?d2) / 4New area = ?(2d/2)2= ?d2Increase in area = (?d2 - ?d2/4)= 3?d2/4? Required increase percent = [(3?d2)/4 x 4/(?d2) x 100]%= 300%
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