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aaaa aaaa Grade: 9
        

If each side of a triangle is tripled find change in% in its area.explain it with full steps

6 years ago

Answers : (1)

Priyansh Bajaj AskiitiansExpert-IITD
30 Points
										

Solution:- Let, the initial sides of triangle be 'a', 'b', and 'c'. Then, semi-perimeter of triangle will be-


s = (a+b+c)/2 and Area of triangle (A) = √s(s-a)(s-b)(s-c).


Now, if each side is tripled. Then, new sides will be 3a, 3b, and 3c. And, semi-perimeter of triangle will be- s'' = (3a+3b+3c)/2  = 3s


and, New area of triangle (A'') = √s''(s''-3a)(s''-3b)(s''-3c) = √3s(3s-3a)(3s-3b)(3s-3c)


                                    A'' = 9 √s(s-a)(s-b)(s-c) = 9A


% change in Area = [(A'' - A)/A] x 100 %


                         = [(9A- A)/A] x 100 % = 800% [ANS]




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Priyansh Bajaj

6 years ago
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