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Plain Geometry

Points, Angles and Planes

Point An exact location in space.
Line A straight path that extends without end in opposite directions.
Plane A flat surface that extends forever.
Segment The part of a line between two endpoints.
Ray A part of a line that starts at one endpoint and extends forever in one direction.
Angle A figure formed by two rays with a common endpoint called the vertex.
Right Angle An angle that measures 90 degrees.
Acute Angle An angle that measures less than 90 degrees.
Obtuse Angle An angle that measures more than 90 degrees and less than 180 degrees.
Complementary Angles Two angles whose measures add to 90 degrees.
Supplementary Angles Two angles whose measures add to 180 degrees.
Vertical Angles A pair of opposite congruent angles formed by intersecting lines.
Parallel Lines Lines in a plane that do not intersect.
Perpendicular Lines Lines that intersect to form right angles.
Transversal A line that intersects two or more lines.
Created by: jharlor