Answer :



ACD = 105o

Since, BCD = 180o (Straight angle)

BCA + ACD = 180o

BCA + 105o = 1800

BCA = 75o (i)


is an isosceles triangle

ABC = ACB (Angle opposite to equal sides)

From (i), we have

ACB = 75o

ABC = ACB = 75o

Sum of interior angle of triangle = 180o

A +B +C =180°

A = 180° - 75° -75°


Therefore, BAC = 30o

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