Line segment, a part of a line, Parallel lines, The lines that nevermeet, Perpendicular lines, The lines that meets at right angle, 131, Obtuse angle, Collinear points, Three points that lie on the same line, acute angle, 60 degree, 180°, Straight angle, Complementary angles, 30,60, Supplementary angles, 150,30, 90°, An angle of a rectangle is

Geometry

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