Supplementary angles - a pair of angles whose sum is always _

Use this applet to understand what the sum of supplementary angles will always be.[br](FYI: supplementary angles do not necessarily need to be adjacent angles, but when they are they can also be called a linear pair.)
Definition of supplementary angles
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– Zawierucha, Duane Habecker

Information: Supplementary angles - a pair of angles whose sum is always _