1.

If the circumference of a circle increases from 2π to 4π then its area _____ the original area(a) Half(b) Double(c) Three times(d) Four times

Answer»

Correct answer is: (d) Four times

If the circumference of a circle increases from 2π to 4π then its area Four times the original area.

C1/C2=2πr/2πR

2π/4π=2πr/2πR

r/R=1/2

A1/A2=πr2 /πR2=(r/R)2=(1/2)2=1/4

A2=4A1



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