Q.17
17. In given figure, show that XY||EF. 

 

36+30=66=angle XYR (which are the pair of alternate angles)
so, XY is parallel to RS
now, 150+30=180(pair of co-interior angles which are supplementry)
​so, RS is parallel to EF
​as, XY parallel to RS 
     RS parallel to EF
​Therefore, XY is parallel to EF
 
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