Question

if the height of an equilateral triangle is 15 cm then what it's perimeter. ( answer 30√3).
I just wana know how too do itt help !!!!​

Answer 1

First, you should know the formula for finding height of the equilateral triangle.

h(height) = (√3/2)a

15 = (√3/2)a

a = 15*2/√3

a = 10√3

length of the side of the equilateral∆ = 10√3

Perimeter of triangle = 3a

Perimeter = 3(10√3)

= 30√3