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# Geometry vocab unit1

TermDefinition
Point No length, width, depth Shows location
Line No width or depth, has infinite length
Plane No depth, has infinite length and width
Collinear Points on the same line
Coplanar Points, lines, angles, etc in the same plane
Non-collinear Points not on the same line (3 or more points; any 2 points are always collinear)
Non-coplanar Not lying in the same plane
Parallel lines Coplanar lines that never intersect
Perpendicular lines Lines that intersect to form a right angle
Segment bisector Line, ray, or segment that intersects another segment at its midpoint
Angle bisector A ray through the vertex of an angle that divides the angle into 2 congruent angles
Midpoint The point exactly in the middle of a segment, dividing it into 2 congruent segments
Congruent Equal in size and shape (physically)
Acute angle Angle whose degree measure is greater than 0 but less than 90
Right angle Angle whose degree measure is 90
Obtuse angle Angle whose degree measure is greater than 90 but less than 180
Linear pair 2 adjacent angles whose non-common sides form a line
Adjacent angles Angles sharing a common vertex and a common side
Vertical angles Angles formed by intersecting lines, sharing only a common vertex
Ray Part of a line having one endpoint and infinite length in one direction
Segment Part of a line with an endpoint on each end; has finite length
Angle Two non-collinear rays sharing a common endpoint
Complementary angles 2 angles whose measures add up to be 90 degrees
Supplementary angles 2 angles whose measures add up to be 180 degrees
Polygon A closed figure made from coplanar, non-collinear segments
Vertex The "corner" point of an angle; the common endpoint
Opposite Rays Collinear rays having only their endpoints in common
Intersection Where two figures meet
Created by: svore