Find the length of the altitude of an equilateral triangle of side \(3\sqrt3\) cm

A 4.5

B 3.5

C 2.5

D 6.5

Correct Answer: Option A

Let the length of the altitude be h.
Then, h = \(a\frac{\sqrt3}2\) = \(3\sqrt3\;\times\;\frac{\sqrt3}2\)

= 4.5