Question

Triangle ABC is an isosceles triangle with AB = AC .If angle B =40 degree what are the measures of angle A and angle C​

Answer 1

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Answer 2

$\huge\mathfrak{Answer}$

According to the question, AB = AC

So, angle B = angle C (Since angles opposite to equal sides are equal.)

Angle B = 40 degree = Angle C.

Sum of all angles = Angle A + Angle B + Angle C

180 = Angle A + 40 + 40

180 - 80 = Angle A

So, angle A = 100 degree.