Question

Find the length of the altitude of an equilateral triangle of side 3√3 cm.

Answer 1

length of altitude = sqrt(3)/2 X length of side.                    sqrt stands for "square root of"
= sqrt(3)/2 X 3 X sqrt(3)
=4.5

Ans. 4.5 cm

Answer 2

Length of the altitude of an equilateral triangle of side "a" units = $\frac{ \sqrt{3}a}{2}$

Length of the altitude =  $\frac{ \sqrt{3}.3 \sqrt{3} }{2}$

                               = 9/2 
                               = 4.5 cm