div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=given-ab-cd-and-bc-prove-abcd-is-a-parallelogram-theorem-611-if-thehtmlpage=1 data-page=1 class=ts-thumb lazyload 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 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader035vdocumentinreader035viewer20220711135fe9e9135a734e757a71991bhtml5thumbnails1jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=2Page 2button div class=ts-imageimg data-url=given-ab-cd-and-bc-prove-abcd-is-a-parallelogram-theorem-611-if-thehtmlpage=2 data-page=2 class=ts-thumb lazyload 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 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader035vdocumentinreader035viewer20220711135fe9e9135a734e757a71991bhtml5thumbnails2jpg width=140 height=200 divdiv