1.

If the area of an equilateral triangle is 81√3cm2, find it's perimeter

Answer»

We know that area is √3/4 a2 
area of the equilateral triangle = 81√3
√3/4 a2 = 81√3
1/4 a2 = 81
a2 = 81(4)
a2 = 324
a = 18cm

Then the perimeter of the equilateral triangle 

= 3×a

= 3×18

=54cm.



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