Extends in two directions endlessly, (AB), Part of a straight line having two endpoints, [AB], Points that lie on the same straight line, Collinear points, Lines intersecting at at a right angle, Perpendicular lines, Lines that never intersect, Parallel lines, A line that crosses two or more other lines., Transversal, The sum of the angles is 360 degrees., Angles at a point, Sum of the two angles is 180 degrees., Supplementary angles, Sum of the two angles is 90 degrees, Complementary angles, The angles are congruent and their sides are extensions of each other, Vertically opposite angles, The angle measures less than 90 degrees, Acute angle, The angle measures 90 degrees, Right angle, The angle measures 180 degrees, Straight angle, The angle measures more than 90 and less than 180 degrees, Obtuse angle

8Amer Geometry

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