00:01
In problem 41, it says, two flat walls meet in the corner of a classroom.
00:07
Which postulate best describes the situation? a, through any three non -coloninear points, there is exactly one plane.
00:15
Now, we can eliminate this simply because when we're talking about walls, walls are planes that can be thought about as planes.
00:26
And notice, we have two of them.
00:28
So, on this one says one, so we can eliminate that one right off the bat.
00:35
Part b says, if two points lie in a plane, then the line containing them lies in the plane.
00:42
Again, we're talking about two walls, which can be represented as, or two planes which are represented as walls, not two points.
00:51
So we can also eliminate this...