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2. Using opposite angles test for parallelogram, prove that every rectangle is a parallelogra

Answer»

Firstprovethat ABM ≡ CDMusingthe SAS congruencetest. (alternateanglesare equal): Hence ABCD is aparallelogram, because one pair ofoppositesides are equal and parallel. ... Hence ABCD isrectangle, because it is aparallelogram withone rightangle.



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