Question

In ∆ABC ,if AB = AC and L B = 70⁰, then L A =.....

Answer 1

Answer:

AB=AC=>LB=LC=70° in ∆ABC LA+LB+LC=180° so LA=180°-70°+70°=40°

Answer 2

correct question ⟱

In ∆ABC ,if AB = AC and ∠A= 70⁰, find ∠B = ∠C

solution ⟱

since , AB = AC , therefore , ∠B = ∠C

by angle sum property of triangle

∠A + ∠B + ∠C = 180°

70° +2 ∠B = 180°

2 ∠B = 110°

∠B = 55°

hence , ∠B = ∠C = 55°