The altitude of an equilateral triangle having perimeter 18 m, is

$3\sqrt{3}$ m $4\sqrt{3}$ m $\frac{\sqrt{3}}{4}$ m $5\sqrt{3}$ m

$3\sqrt{3}$ m

Perimeter of a equilateral triangle = 18m then the side = \(\frac{18}{3}\) = 6m Altitude of the triangle = \(\frac{\sqrt {3}}{2}\) × (side) = \(\frac{\sqrt {3}}{2}\) × (6) = $3\sqrt{3}$ m