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Question

Consider the figure:

If A=50​, ACD=120​, and x=2y, then B= ___ .

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Solution

Given, ACD=120
Hence, ACB=180120=60
[linear pair]

Using angle sum property of triangle, in ABC, we have
A+B+C=180
Substiuting the given values, we have,

B=180AC

=1805060=70


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