If the area of an equilateral triangle is 81√3 sq cm, find it's side – InterviewSolution

1.

If the area of an equilateral triangle is 81√3 sq cm, find it's side

Answer»

Answer:

18

Step-by-step explanation:

Let side of triangle is a

then height of triangle BECOMES ASIN(60) = a(√3)/(2)

Then AREA of triangle is

(1)/(2)*a*a(√3)/(2)= 81√3

a^2 = 364

a = 18

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