Question

if length of a side of equilateral triangle is 10m and if its side is decreased by 15% then by how much% its area will decrease?
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Answer 1

Answer:

Since here the side of an equilateral triangle decreased by 20%, the side's new length is 0.8 times its old length and thus the new area of the equilateral triangle is 0.8^2 = 0.64 times its original area, i.e., 64% of its original area. We see that this is a 36% decrease