Supplementary Angles
Supplementary Angles are any pair of angles whose sum (adding) is equal to 180 degrees (straight angle).
Explicit Instruction: Supplementary Angles
![Image](https://beta.geogebra.org/resource/b474tbj5/QbDnSmuGQN3oVnCS/material-b474tbj5.png)
Remember that pairs are things that come in twos. For example, the pair of dice above is called a pair because there are two of them. Can you think of any other types of pairs?
Supplemental Angles
![Supplemental Angles](https://beta.geogebra.org/resource/a9bq8nmy/zG6JM3ilkTC7Kuba/material-a9bq8nmy.png)
So, any PAIR of angles that have a sum of 180 degrees are supplementary angles.
![Image](https://beta.geogebra.org/resource/hfbcqwb5/vf2yrTA2tsVGUX0n/material-hfbcqwb5.png)
We can use that truth to solve problems in Geometry!
Supplemental Angle Problem
![Supplemental Angle Problem](https://beta.geogebra.org/resource/ufubmuam/fDpkwx5Wz0TVTIwc/material-ufubmuam.png)
We know that line m is a straight line.
If line m is a straight line, then we know its measure is 180 degrees
We know that the larger angle has a measure of 118 degrees, but we don't know what the measure of its supplemental angle is (x).
I set up an equation based on the postulate: x + 118 = 180
I subtract 118 from both sides of the equal sign x = 62