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 to
A. 80°

B. 75°

C. 60°

D. 90°

Answer :

By exterior angle theorem:

ACD = A + B

120o = A + A

120o =

240o = 3A

A = 80o

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