In a triangle ABC, AB = AC, ∠BAC = 40°. Then the external angle at B is
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110°
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Step-by-step explanation:
the external angle of B is 140 degrees
because as AB=AC
ANGLE B=ANGLE C (ANGLES OPPOSITE THE SIDES ARE EQUAL)
G.T ANGLE A=40
180-40=70
SO ANGLE B = 70
ANGLE C=70
external angle of B=180-angleB
=180-70
=110
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