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Geometry Chapter 1

TermDefinition
line segment Part of a line that consists of two endpoints and all points between them
ray A part of a line, with one endpoint, that continues without end in one direction
plane A flat surface that has no thickness and extends forever
line Made up of points, extends forever in two directions
point An exact location in space
midpoint A point that divides a segment into two congruent segments
angle A figure formed by two rays with a common endpoint
vertex The common endpoint of an angle
collinear Points that lie on the same line
ray A part of a line, with one endpoint, that continues without end in one direction
linear pair A pair of adjacent angles whose noncommon sides are opposite rays.
vertical angles A pair of opposite congruent angles formed by intersecting lines
parallel Lines in the same plane that never intersect
perpendicular Lines that intersect to form right angles
coplanar Points that lie on the same plane
adjacent angles Angles that have a common vertex and a common side.
bisector cuts an object into two equal parts
complementary Two angles sum to 90 degrees
supplementary Two angles sum to 180 degrees