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Question

In the triangle ABC, BC = CD and (ABCBAC)=30. The measure of ABD is :

  1. 30
  2. 45
  3. 15
  4. Cant be determined


Solution

The correct option is C 15
ABD=ABCDBC
=ABCBDC
=ABC(ABD+BAD)
2(ABD)=ABCBAD=30
ABD=15
BAD=BAC

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