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Geometry Terms

types of lines, polygons, and angles

TermDefinition
point an exact location in space; named by a capital letter
line segment a part of a line with two endpoints, named by the two endpoints
ray a part of a line with one endpoint that extends forever in one direction; named by the endpoint first followed by another point on the ray
line a straight mark that doesn't end
perpendicular lines two lines cross and make a 90 degree angle
parallel lines the same distance apart, they never meet
polygon a closed plane shape with 3 or more straight sides
regular polygon a polygon where all sides and angles are equal
irregular polygon a polygon where all sides and angles are not equal
parallelogram a quadrilateral whose opposite sides are parallel
quadrilateral a polygon with 4 straight sides
angle the space between two rays
obtuse angle an angle that is greater than 90 degrees and less than 180 degrees
right angle a 90 degree angle
acute angle an angle that is less than 90 degrees
protractor a tool used for measuring and drawing angles
Created by: Marquisgr4