Question

detailed solution please

Answer 1

Let's take X as angle BAC , 1 as angle ABC and 2 as angle ACB.

so angle 2 = 180° - 105° = 75°

so as the line AB = AC

so angle 1 = angle 2 = 75°

as we know that the sum of all interior angles is 180°

so angle 1 + angle2 + angle X = 180°

so X = 180 - (75 + 75)

X = 180 - 150

X= 30°

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