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complementary angle,supplementary angle

complementary angles: definition, theorem & examples
complementary angles: definition, theorem & examples(直角),就说这 两个角互为余角(complementary angle) 2 1
(直角),就说这 两个角互为余角(complementary angle) 2 1exterior angle外角 supplementaryangles补角 complementaryangle
exterior angle外角 supplementaryangles补角 complementaryangle弧形 straight 直线 curved line曲线 intersect 相交 角  | angle
弧形 straight 直线 curved line曲线 intersect 相交 角 | angletransversal in geometry: definition & angles
transversal in geometry: definition & angles
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