00:01
So for this problem, our goal is to figure out what goes in this question mark spot here in this proportion between two ratios.
00:10
So we can use the three parallel lines theorem, since we have three parallel lines, and these three parallel lines cut through to other lines, which we call transversals.
00:25
So these two lines here and here, longer lines, these are called transversals, and the three lines that connect, or that cut through the transversals, these are the transverse lines.
00:43
And by the three parallel lines there, right? if i have three transverse lines are parallel to one another, and since they're transverse lines, they have to cut through two transversals here.
00:56
Then these transversal lines divide up the transversals proportionally to one another.
01:04
So the way it works here, right, if i look at the distance bd and c .e, they're both in the denominator.
01:11
I'll put it in blue.
01:14
If i look at bd and c .e.
01:16
It knows how they're opposite to one another here...