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Geometry Basics I

Basic Geometric Terms, Including Angles and Lines

Point A specific location or mark usually identified by a letter
Line An endless straight path with no endpoints
Line Segment Part of a line between two endpoints
Ray A part of a line that has one endpoint and goes on forever in one direction
Plane An endless flat surface that uses three nonlinear points for its name
Vertex The point where two rays meet, creating an angle
Acute Angle An angle that measures less than ninety degrees
Right Angle An angle that measures exactly ninety degrees
Obtuse Angle An angle that measures greater than 90 degrees but less than 180 degrees
Protractor The semicircular instrument used to measure and/or construct an angle
Polygon A two-dimensional shape that has three or more sides
Intersecting lines Any lines that meet at a point. They do not have to form a ninety-degree angle.
Parallel lines Two lines that are an equal distance apart which will never meet
Perpendicular lines Two lines that meet to form a right angle
Compass An instrument that can be used to construct a circle
Created by: Rvanmeter