the radius of a circle is 50 cm if radius is decreased by 50% its area will be decreased by?
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r1= 50cm
a1 = π r1^2
r2 = r1/2 = 25cm
a2 = π (r1/2)^2
a2 = 1/4 πr1^2 = 25% of a1
a1 = π r1^2
r2 = r1/2 = 25cm
a2 = π (r1/2)^2
a2 = 1/4 πr1^2 = 25% of a1
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