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Question

In the following figure , ABCD is a parallelogram . Find the value x,y and z .
1485579_a7b75eb7657d4cedb4b2ccab14609d8e.png

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Solution

From the figure
ADBC,BD is the transversal line
ADB=DBC (alternate angles)
z=30
Also
100,x are supplementary angles
So x=180100=80
x,y,30 forms a triangle
x+y+30=180
y=1808030=70

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