00:01
Let's work on finding the missing angle in supplementary angles.
00:05
We have to find the supplement angle.
00:06
Remember, supplement angle means that it adds to 180 degrees, otherwise known as a straight line.
00:26
Let's say i have an angle measurement of 71 degrees, and i want to find the missing part of two ways we can do this.
00:36
First way is doing the visual.
00:37
Where we draw a straight line and an angle measurement that cuts in between the straight line.
00:45
We know one part of it's going to be 71 degrees.
00:50
The other part, we don't know.
00:53
We're going to label this x.
00:56
Well, if we know the two angle measurements here equals 180 degrees, if we add them together, x plus 71 degrees and set it equal to 180 degrees, is going to help us find out what that x value is going to be.
01:13
Now we're dealing with a one -step equation.
01:16
We want to be able to get the x variable here alone.
01:20
You don't want it to have any number on the left -hand side.
01:22
We want to move this 71 to the right -hand side...