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+1 vote
in Mathematics by (7.9k points)

In a ΔABC, if AB = AC and ∠B = 70°, find ∠A.

1 Answer

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Best answer

Consider, ΔABC we have B=70° and AB=AC

Since, AB=AC  ΔABC is an isosceles triangle

⇒ ∠B=∠C   [Angles opposite to equal sides are equal]

⇒ B=∠C=70°

And also,

Sum of angles in a triangle = 180°

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