Perpendicular Lines - Two lines that form a right angle, Obtuse - an angle whose measure is greater than 90 degrees, Line - A set of points whose length goes forever in two opposite directions, Acute - an angle whose measure is less than 90 degrees, Right Angle - An angle whose measure is 90 degrees, Parallel Lines - Made up of lines that are equal distance apart which travel in the same direction, they will never intersect, Intersecting Lines - Lines that are neither perpendicular nor parallel to each other, Point - A dot, an exact location, Line Segment - Part of a line that has two end points, Ray - A line with one endpoint,

Basic Concepts of Geometry

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