SOLUTION: Given AD= BC and AB = CD Prove triangle CDB is congruent To triangle ABD

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Question 1010570: Given AD= BC and AB = CD
Prove triangle CDB is congruent To triangle ABD
Answer by ikleyn(52793) About Me  (Show Source):
You can put this solution on YOUR website!
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Given AD= BC and AB = CD
Prove triangle CDB is congruent To triangle ABD
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Apply SSS-test for triangles.

You can also look into the lesson Properties of the sides of a parallelogram in this site, Theorem 2:

    If in a convex quadrilateral the opposite sides are of equal length by pairs,  then the quadrilateral is a parallelogram.