Acute Angle - An angle that is less than 90º, Obtuse Angle - An angle that is between 90º and 180º, Line Segment - Part of a line that has two endpoints, Point - An exact location in space, represented by a dot, Line - Extends in two directions forever, Ray - Part of a line with one endpoint that extends in one direction indefinitely, Plane - A flat surface that extends in all directions, Full Rotation - An angle that measures 360º, Right Angle - An angle that measures 90º, Straight Angle - An angle that measures 180º, Reflex Angle - An angle that is between 180º and 360 º, Opposite Rays - Rays with a common endpoint that go in opposite directions, Complementary Angles - Angles that add up to 90º, Supplementary Angles - Angles that add up to 180º, Adjacent Angles - Angles that share a common side (next to each other), Vertical Angles - angles that are across from each other and congruent, Collinear - Points on the same line, Coplanar - Points on the same plane, Congruent - Equal in measure, Intersects - Crosses each other,

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