Theorem: A quadrilateral is a parallelogram if a pair of its opposite sides is parallel and congruent. : In ABCD seg CB seg DA and seg CB || seg DA To prove : ABCD is a parallelogram. Construction : Draw diagonal BD. Write the complete proof which is given in short. Fig. 5.18 A CBD E A ADB____ SAS test LCDBE ZABD______ c.act. seg CD || seg BA alternate angle test for parallel lines B A________
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A quadrilateral is a parallelogram if a pair of its opposite sides is parallel and congruent.
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