Supplementary Angles, A+B = 180 Degree, Complementary Angles, A+B = 90 Degree, Vertical Angles, , Elements of an Angle, Two Segments and Vertex, Straight Angle, 180 Degree, Reflex Angle, More than 180Degree, Acute Angle, Less than 90Degree, Obtuse Angle, Between 90 and 180 Degree.

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