Question

The diameter of a sphere is decreased by 25% By what per cent does its curved surface area decrease?

Answer 1

By the formula:
if diameter of of a sphere is decereased by x% then % decreased in its C.S.A= (2x+x^2/+100)%
so,
here x= -25
then,
(2×-25+-25×-25/100)%= - -4375/ 100= -43.75%
here negative sign shows the decreased %

Hope,it helped

Answer 2

here x= -25
then,
(2×-25+-25×-25/100)%= - -4375/ 100= -43.75%
here negative sign shows the decreased %
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