00:01
Okay, so for this question, we have a quadrilateral, in particular, quadrilateral abdc, but it's drawn this way, a, a, b, c, d, and we are told that ab is, actually, let me, let's use red for this.
00:26
A, b is parallel to cd.
00:30
So the question is, what additional information do we need to say? that this is a parallelogram.
00:35
Well, we've got a couple of choices.
00:37
Choice one is to say, well, if the other pair of sides is parallel, then we can conclude that abdc is inherently a parallelogram by the very definition.
00:53
Two pair parallel sides...