or
or
Circumference of a circle increases only with radius. Therefore, radius of the circle gets increased by 50%. Now, new radius = R + 50% of R = 1.5R
Initial area = π R2
New area = π (1.5R)2 = 2.25 π R2
Percent increase = ((2.25 π R2) - (π R2)} / (π R2) x 100% = 125%
