Explanation: যেহেতু Equilateral triangle, সব গুলো angle 60° হবে। center এ 120° হবে (angle in a segment) তাহলে EB = EC = 2 (radius) 30:30:120 ratio অনুযায়ী side হবে \(2, 2, 2\sqrt{3}\) BC হবে \(2\sqrt{3}\) তাহলে area of an equilateral triangle \(\frac{\sqrt{3}}{4}a^{2}=\frac{\sqrt{3}}{4}(2\sqrt{3})^{2}=3\sqrt{3}\).
