Question

In a Δ ABC, if AB =BC 120° and ∠B = 70°, Find ∠A.

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Given : In a Δ ABC, if AB = AC and ∠B = 70°. [Mistake in the question]

Δ ABC is an isosceles triangle since AB = AC.

∠B = ∠C = 70°

[Angles opposite to equal sides are equal]

We know, that sum of angles in a triangle is 180° :

∠ A + ∠ B + ∠ C = 180°

∠A + 70° + 70° = 180°

∠A + 140° = 180°

∠A = 180° - 140°

∠A = 40°

Hence, ∠ A =  45°.

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