# The opposite sides of a quadrilateral are parallel. If one angle of the quadrilateral is 60° find the other angles.

AB CD and AD is transversal

Therefore,

A + D = 180o(Co. interior angles are supplementary)

60o + D = 180o

D = 120o

Now,

AD BC and AB is transversal

A + B = 180o(Co. interior angles are supplementary)

60o + B = 180o

B = 120o

Hence,

A = C = 60o

B = D = 120o

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