Question

solve this question in steps ​

Answer 1

Answer:

∠A = 60°

Step-by-step explanation:

Let ∠120° = ∠1

∠C = 180° - 120° ( sum of angles of linear pair is 180°)

∠C = 60°

AB = AC ( GIVEN...)

∠B = ∠C ( Line AB and AC are equal. And angles opposite to equal sides                                                                ∠B = 60°   are also equal. )

∠1 = ∠A + ∠B ( Ext. angle = sum of opposite angles of a triangle )

120°= ∠A + 60°

120° - 60° = ∠A

60° = ∠A

Hence-:

∠A = 60°

This is a equilateral triangle.

Hope it helps!