In ∆ABC ,if AB = AC and L B = 70⁰, then L A =.....
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Answer:
AB=AC=>LB=LC=70° in ∆ABC LA+LB+LC=180° so LA=180°-70°+70°=40°
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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°
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