Question

In a ΔABC , if ∠A = 120° and AB = AC , Find ∠B
30°
40°
50°
60°​

Answer 1

Answer:

∠B = 30° (option 1)

Step-by-step explanation:

AB = AC

Angles opposite to equal sides are equal

Therefore ∠B = ∠C = x°------ (1)

By Angle sum property

∠A + ∠B + ∠C = 180°

120° + x° + x° = 180°---- ( from (1) and given )

2x° = 180° - 120°

x° = 60°/2

x° = 30°

Therefore ∠B = 30°

∠C = 30°

Hope it helps..