Question
If the circumference of a circle increases from ` 4 pi to 8 pi`, what change occurs in its area ?
Answer: Option D
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`2piR_1 = 4 pi and 2pi R_2 = 8 pi`
`rArr R_1 = 2 and R_2 = 4`
`rArr` Original area = `(4 pi xx 2^2) = 16 pi`
Increased area = `( 4 pi xx 4^2 ) = 64 pi`
Thus , the area quadruples .
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