SOLUTION: Given: AB||DC AD||BC Prove: angle A and angle B are supplementary

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Question 1010928: Given: AB||DC
AD||BC
Prove: angle A and angle B are supplementary
Answer by ikleyn(52864) About Me  (Show Source):
You can put this solution on YOUR website!
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Given: AB||DC
AD||BC
Prove: angle A and angle B are supplementary
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Angle A and angle B are supplementary as they are interior angles on the same side at
two parallel lines AD and BC and the transverse AB.

See the lesson  Parallel lines  in this site,  Parallel transversal theorem.