Let's take quadrilateral, ABCD, where the following is given:
AC is parallel to BD
AB is perpendicular to BD
AB is congruent to CD
Given the above, is it correct to conclude that CD is also perpendicular to BD, since AB and CD are congruent.
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Different geometry courses get to different theorems (or rules) in different orders. What results have you learned recently?Where would I start on how to prove that conclusion ?