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Question

Consider the figure:

If B = 50, ACD = 120, and x = 2y, then find the value of A (in degrees).


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Solution

Given, ACD = 120
Hence, ACB = 60​ (linear pair)
Using angle sum property of triangle, in ΔABC, we have
A+B+C=180
Substiuting the given values, we have,
A = 70


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