Question

The Perimeter of an equilateral triangle is 90 cm. Calculate its area​

Answer 1

Step-by-step explanation:

Since,In an equilateral triangle all the sides are equal.

Let each side be x

Given,

Perimeter=90cm

Perimeter of a triangle= Sum of all sides

=>x+x+x =90

=>3x =90

=> x =90/3 = 30cm

Side of triangle = 30cm

Area of equilateral triangle=√3side/4 √3×30/4 = √90/4