Height of the equilateral triangle = 20√2 ⇒ (√3/2) side = 20√2 ⇒ Side = (40√2)/√3 cm ⇒ Area of equilateral triangle = (√3/4) side2 = (√3/4) × [(40√2)/√3]2 ⇒ Area of equilateral triangle = 800√3/3 cm2 ∴ Area of equilateral triangle is 800√3/3 cm2.