What is the area (in m2) of an equilateral triangle of side 20 m?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → \(100\sqrt{3}\)
The area of an equilateral triangle of side \(a\) is \(\frac{\sqrt{3}}{4}a^2\).
Area \(\displaystyle =\frac{\sqrt{3}}{4}\times20^2=\frac{\sqrt{3}}{4}\times400=100\sqrt{3}\) m2