Question

the diameter of sphere is decreased by 25 per cent .by what per cent does its csa decrease​

Answer 1

Answer:

Step-by-step explanation:

Let the initial radius be=r

On decreasing by 25%,new radius=r-((25/100)xr)=3r/4

Initial surface area=4πr²

Final surface area=4π(3r/4)²=4π9r/16

% of new surface area=56.25%

% of decrease in area=(100-56.25)%=43.75%

Answer 2

Your answer is......

43.75%

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