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並前往https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-angles/v/complementary-and-supplementary-angles

Complementary & supplementary angles - Khan Academy

Two angles are linear if they are adjacent angles formed by two intersecting lines. A straight angle is 180 degrees so 2 linear pairs of angles must always ...

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