If ABC is an equilateral triangle, then each angle equals to:

In Equilateral triangle, all its sides are equal and each angle measures 60°.

BC = AC = AB ( All sides are equal )

Thus, ∠A = ∠B = ∠C ( Opposite angles of the equal sides )

Also, we know that,

∠A + ∠B + ∠C = 180°

⇒ 3∠A = 180°

⇒ ∠A = 60°

∴ ∠A = ∠B = ∠C = 60°