if the radius of a circle is decreased by 50% its area will be decreased by
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50% =1/2
old radius 2
new radius 1
so
π(2)^2 =4π
new π(1)^2=π
so reduction = 4π - π =3π
3π/4π ×100=75% reduction
in area
old radius 2
new radius 1
so
π(2)^2 =4π
new π(1)^2=π
so reduction = 4π - π =3π
3π/4π ×100=75% reduction
in area
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