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Math Learning for Kids

Supplementary Angles Explained: Why They Always Add Up to 180°

Have you ever noticed that when you open a door all the way flat against the wall, the two angles formed by the door and the wall make a straight line? That’s exactly what supplementary angles are! Think of a straight line as a half-turn or a perfect flat road. Many 4th–8th graders get confused between supplementary () and complementary…

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