In the figure, AB || DC and ?B ? ?D. Prove that AD || BC
Prove the following statements using either a paragraph proof or a two-column proof. Be sure to justify your conclusions.
(Outline) ?BAC ? ?ACD (alternate interior angles) and AC ? AC. So ?ABC ? ?CDA by AAS. Then ?BCA ? ?CAD by C.P. and then AD || BC, since alternate interior angles are congruent.
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