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Supplementary Angles
Two angles which sum up to 180° are called supplementary angles.
Supplementary angles don't have to be next to each other, just so long as the total is 180°. Here's an example:
As a is parallel to b, angles "3" and "6" sum up to 180°. Hence, they are supplementary angles.
More Information:
- Supplementary Angles article: Varsity Tutors