Supplementary Angles
A supplementary angle is 2 angles that add up to 180 degrees. Supplement comes from the latin supplere which means to complete or "supply" what is needed.
Examples:
An example of a supplementary angles is 60 degrees and 120 degrees because 60 degrees + 120 degrees = 180 degrees, but the lines don't have to be together. They can be separate, so long as if they were together they would add up to 180 degrees.
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Definitions:
When two angles add up to 180 degrees we say that they supplement each other, because the two angles supply what is needed to complete the 180 degrees. To remember, "S" of Supplementary stands for straight. (180 degrees is a straight line.)
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See Some Examples
Here's some practice on supplementary angles:
http://www.math-play.com/Angles-Jeopardy/Classifying-Angles-Game.html
http://www.math-play.com/Angles-Jeopardy/Classifying-Angles-Game.html