Question

how do you find altitude of equilateral triangle?

Answer 1

if you know the formula use it or do by pythagoras theorem 
ex :
by Pythagoras theorem 
if sides of eq. tri. is a
hyp= a
base= a/2
and the h= √3a square/4

Answer 2

height of an equilateral triangle is always = √3/4

so no need to find