This document defines key geometry vocabulary terms including point, line, plane, line segment, ray, parallel lines, intersecting lines, and perpendicular lines. A point is an exact location in space. A line is a straight path of points that extends indefinitely in two directions. A plane is an endless flat surface. A line segment has two endpoints. A ray has one endpoint and extends in one direction indefinitely. Parallel lines never cross and remain the same distance apart, while intersecting lines cross at a point. Perpendicular lines intersect to form a 90 degree angle.
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