line - a straight path of points that continues without end in both directions, line segment - part of a line between two endpoints, ray - part of a line that has one endpoint and continues on without end in one direction, point - an exact location in space, angle - the amount of turning between 2 rays measured in degrees, symmetrical - when one half is the same as the other half, parallel lines - lines that are always an equal distance apart and will never intersect, perpendicular lines - lines that intersect to form right angles, right angle - ONE angle that measures exactly 90 degrees, acute angle - an angle that is less than 90 degress, obtuse angle - an angle that is greater than 90 degrees and less than 180 degress, Linear - ONE angle that measures exactly 180 degrees, intersect - when lines meet or cross over one another , Midpoint - A point in the exact center of two other points on a line, Endpoint - The point at the end of a line segment, Angle Bisector - A ray that divides an angle into two equal parts, Complementary Pairs - TWO angles that don't have to touch and add up to 90°, Supplementary Pairs - TWO angles that don't have to touch and add up to 180°, Linear Pairs - TWO angles that are adjacent and add up to 180°, Vertical Angles - Angles that are across from each other, share a vertex and are same angle measures,

Geometry Proof and Reasoning Vocabulary

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