If the side of an equilateral triangle is 20 cm, then what is its area?
Answer & explanation
Correct answer: option 4
Area of a equilateral triangle = \(\frac{\sqrt {3}}{4}\) × (side)2
Side = 20cm
Then the area = \(\frac{\sqrt {3}}{4}\) × (20)2
= $100 \sqrt{3}$ cm2