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In Fig. if AB || CD, CD || EF and y : ...

In Fig. if AB || CD, CD || EF and `y : z=3:7`, find x.

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AB||CD and CD||EF
that means AB||EF
alternate angles made with a transverse line PQ
x=z
`y/z=3/7`
`y/x=3/7`
AB||CD sum of interior angles on same side=180^o
x+y=180^o`
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