The diameter of a sphere is decreased by 25%. By what percent does its curved surface area decrease ? a) 42% b) 43.75% b c) 43% d) 75%
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Answered by
0
Answer:
b)43.75%
Step-by-step explanation:
Original Diameter =d
Original CSA=4π(d/2)²=πd²
New Diameter =d−25/100d=3d/4
New CSA=4π(3d/8)²=9/16πd²
% decrease =(πd²−9/16πd²)/πd²×100
=πd²/πd²(1−9/16)×100
=(16−9)/16×100
=43.75%
hope it helps!!
Answered by
1
Answer:
25%
Step-by-step explanation:
well, according to me the answer must be 25 percent and it's not in the option, so there's a possibility that the answer is not in the options.
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