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Question

If side BC of a triangle ABC is extended to D and ACD=120, then A+B= .

A
120
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B
100
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C
60
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Solution

The correct option is A 120

The exterior angle of a triangle is equal to the sum of the opposite interior angles.

Since the exterior angle = 120, the sum of the two interior angles is also 120.
Thus, (x+y) =A+B = 120


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