Question

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Answer 1

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ANGLE bac + ANGLE bca +  ANGLE  abc= 180            (angle sum property)

angle bac + 21 + 90 =180

angle bac =  180 - 111

angle bac=  69 degrees

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Answer 2

Answer:

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ABC is a right angled triangle.

Sum of all angles of triangle = 180°

A.T.Q

Angle A + Angle B + Angle C = 180°

Angle A + 90° + 21° = 180°

Angle A + 111° = 180°

Angle A = 180°-111°

Angle A = 69°

So, Angle BAC = 69°

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