Hi Rajbir, the question you have asked is Theorem 8.8 of Class 9, check http://teachoo.com/4281/1043/Theorem-8.8---Class-9th---If-a-pair-of-opposite-sides-is-equal---parallel,-quad.-is-a-parallelogram/category/Theorems/
Written on Dec. 13, 2016, 10:38 a.m.