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The sides of a triangle are in the ratio 3 : 4 : 5 whose area is 216 sq. cm.
What will be the perimeter of this triangle?

A.58 cm
B.60 cm
C.72 cm
D.50 cm
Answer and Feedback
Answer:C
Feedback:Sides 3x, 4x, 5x
So semi-perimeter, s = (3x+4x+5x)/2 = 6x
Area = √s(s-a)(s-b)(s-c)
= √6x*3x*2x*x = 6x2 cm2
So 6x2 = 216, this gives x = 6
Perimeter = 12x = 12*6 =72

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