Q. 55.0( 2 Votes )

# Side BC of a triangle ABC has been produced to a point D such that ∠ACD = 120°. If ∠B = ∠A, then ∠A is equal toA. 80°B. 75°C. 60°D. 90°

By exterior angle theorem:

ACD = A + B

120o = A + A

120o =

240o = 3A

A = 80o

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