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4th Grade Geometry

TermDefinition
Point A location in space
Line Segment Part of a line with two endpoints
Ray Part of a line with one endpoint
Line Points connected in a straight path that goes on forever
Parallel Lines Lines that never intersect
Intersecting Lines Lines that cross
Perpendicular Lines Lines that intersect to create 90 degree angles
Angle Two rays that share an endpoint
Right Angle 90 degree angle
Vertex The shared endpoint of an angle
Acute Angle Less than 90 degrees
Obtuse Angle Greater than 90 degrees
Straight Angle 180 degrees
Polygon A closed plane figure with three or more sides
Triangle A 3-sided polygon
Rectangle A 4-sided polygon where all angles measure 90 degrees
Square A 4-sided polygon where all angles measure 90 degrees and all sides are equal in length.
Pentagon A 5-sided polygon
Hexagon A 6-sided polygon
Heptagon A 7-sided polygon
Octagon A 8-sided polygon
Nonagon A 9-sided polygon
Decagon A 10-sided polygon
Created by: NJustison
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