A traffic signal board, indicating ‘SCHOOL AHEAD’, is an equilateral triangle with side a. Find the area of the signal board, using Heron’s formula.If its perimeter is 180 cm, what will be the area of the signal board?

So, all sides are equal to a.

Perimeter of triangle = 180 cm [given]

=> a + a + a = 180

3a = 180

a = 60 cm

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