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let y =3a and z= 7a and let the point of intersection of line segment cd and gf be h
so angle dhi+angle fih =180 (co interior angles)
angle y+angle z =180
3a+7a =180
10a =180
a =18
so angle y =3×18=54
and angle z =7×18=126
also angle x+y=180(co interior angle)
X+54=180
x=180-54
x=126
so angle dhi+angle fih =180 (co interior angles)
angle y+angle z =180
3a+7a =180
10a =180
a =18
so angle y =3×18=54
and angle z =7×18=126
also angle x+y=180(co interior angle)
X+54=180
x=180-54
x=126
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