Question

if it's perimeter of an equilateral triangle is 120 CM, what will be its area

Answer 1

Hi...☺

Here is your answer...✌

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Given that,
Perimeter of Equilateral triangle = 120 cm

a+a+a = 120 cm

3a = 120 cm

=> a = 40 cm

Now,

Area of equilateral triangle = (√3/4)×a²

= (√3/4)×40×40

= √3×10×40

= 400√3 cm²