What is the altitude of an equilateral triangle whose side is 20 cm?

7\(\sqrt{3}\) cm 8\(\sqrt{3}\) cm 3\(\sqrt{3}\) cm 10\(\sqrt{3}\) cm

10\(\sqrt{3}\) cm

(a =  side of an equilateral triangle) Altitude of an eq. triangle = \(\frac{\sqrt{3}}{2}\) × a = \(\frac{\sqrt{3}}{2}\) × 20 = 10\(\sqrt{3}\) cm