Question

3. In ∆ABC, BC=AB and ∠B=70°. Then ∠A = ______

Answer 1

Answer:

IT'S angleA + angleB + angleC = 180° -70°

THEN, angleA + angleC = 110°.

but, BC=AB

THEREFORE, 110/2

angleA = 55°.

and also, angleC = 55°.

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