**Find the height of the equilateral triangle when its perimeter is 18.**

perimeter = 18

side = 18 / 3

side = 6

height = ( 6 * sqrt(3) ) / 2

height = 5.1962

where,

a = side

p = perimeter

A = area

h = height

m = median

t = angle bisector

R = circumscribed circle radius

r = inscribed circle radius

s = semi perimeter