ABCD is a parallelogram,
AB II CD AND AD II BC,
AC is the interesting line,
Angle CAD = Angle ACB = 40degree (Alternating angles),
Angle COD =Angle COB = 180
=100 + COB = 180,
COB = 180-100=80,
80 + Y + 40 = 180,
180 - 120 = 60,
100+ACD +X = 180,
180 - 100+30 = 50,
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