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# Geometry

TermDefinition
quadrilateral a polygon with 4 sides and 4 angles
degrees the measurement of an angle
right angle an angle that measures 90 degrees
parallel two lines that never meet or intersect each other
symmetry a figure that has two halves that match - when cut in half, the two pieces will be identical
intersecting two lines that cross or cut through each other
obtuse triangle a triangle with one obtuse angle and two acute angles
perpendicular two lines that cross or cut through each other and form a 90 degree angle
acute triangle a triangle with three acute angles
right triangle a triangle with one right angle and two acute angles
acute angle an angle that measures less than 90 degrees
obtuse angle an angle that measures greater than 90 degrees, but less than 180 degrees
TRI- a prefix meaning "three" (a TRIangle is a 3 sided figure with 3 angles)
QUAD- a prefix meaning "four" (a QUADrilateral is a 4 sided figure with 4 angles)
line continues in both directions with no end (arrows on both sides).
line segment a part of a line (endpoints on both sides)
ray a line that continues in one direction with no end (one endpoint and one arrow)
point a location (a dot)
Created by: edonahue22