Question

In AABC, if AB = AC and ZB = 70°, find angle A
(4) 80
(1) 50°
(2) 40
(3) 70°

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Answer 1

Step-by-step explanation:

70° is the correct answer

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Answer 2

Answer:

If AB = AC

angle C = angle B

As angle B = 70 degree

and angle C = angle B

implies angle C = 70 degree

According to angle sum property of triangle

angle A + angle B + angle C = 180 degree

angle A + 70 degree + 70 degree = 180 degree

angle A + 140 degree = 180 degree

angle A = 40 degree.

Therefore the measure of angle A is 40 degree.

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