AB||CD ,CD|| EF and y:z =3:7,find x.

1.	AB\|\|CD ,CD\|\| EF and y:z =3:7,find x.
Answer» Let angle be=r, So,3r:7r, Z=x=7r (alternate), X+y=180 (sum of co- interior), 7r+3r=180, 10r=180, r=180/10, r=18, X=7×18=126

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