div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: Given: AB -CD and BC Prove: ABCD is a parallelogram Theorem 611 - If the diagonals of a quad bisect each other Theorem 612 - If one pair of opposite sides of a quad are congruent src=https:reader035fdocumentsusreader035viewer20220711135fe9e9135a734e757a71991bhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 2button div class=trans-image amp-img class=trans-thumb alt=Page 2: Given: AB -CD and BC Prove: ABCD is a parallelogram Theorem 611 - If the diagonals of a quad bisect each other Theorem 612 - If one pair of opposite sides of a quad are congruent src=https:reader035fdocumentsusreader035viewer20220711135fe9e9135a734e757a71991bhtml5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdiv