ABC is an isosceles triangle with AB = BC. Find the ∠A.

60°

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70°

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80°

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75°

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Solution

The correct option is B 70°
ABC is an isosceles triangle with AB = BC
⇒ ∠B =∠C = 55°
Using angle sum property,
∠A + ∠B + ∠C = 180°
∠A = 180° - ∠B - ∠C
⇒ ∠A = 180° - 55° - 55° = 70°

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