If ad||bc and ab||cd than prove that angledab =angledcb
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since Ab||DC and ad||BC
therefore it is a parallelogram and if you join db then abcd will be divided into two equal parts dab and dcb and by using SSS you can prove angle dab equal to angle dcb
therefore it is a parallelogram and if you join db then abcd will be divided into two equal parts dab and dcb and by using SSS you can prove angle dab equal to angle dcb
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