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Geometry Vocabulary

TermDefinition
Parallel Lines 2 lines lying in the same direction that never intersect.
Perpendicular Lines 2 lines that intersect at 90 degrees.
Vertex A point where 2 lines meet.
Ray A part of a line that extends indefinitely in one direction.
Line 1-dimensional figure that extends infinitely in both directions.
Line Segment Part of a line with 2 endpoints.
Right Angle An angle that measure 90 degrees.
Acute Angle An angle that measures less than 90 degrees.
Obtuse angle An angle that measures more than 90 degrees.
Polygon A closed figure that has straight lines.
Scalene Triangle A triangle that has side lengths that are all different.
Isosceles Triangle A triangle that at least 2 equal side lengths.
Equilateral Triangle A triangle that has all equal side lengths.
Congruent Having the same measure.
Regular Polygon A type of polygon with all congruent sides and angles
Irregular Polygon A type of polygon that does not have congruent sides and angles
Pentagon A 5 sided polygon
Hexagon A 6 sided polygon
Octagon An 8 sided polygon
Parallelogram A quadrilateral with 2 pairs of parallel lines
Trapezoid A quadrilateral with exactly 1 pair of parallel lines
Rectangle A parallelogram with 4 right angles and opposite congruent sides
Rhombus A parallelogram with 4 congruent sides
Square A parallelogram with 4 congruent sides and 4 right angles
Created by: ccoipel
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