Chapter 1 PH Geometry Vocabulary

Terms	Definitions
Conjecture	A conclusion you reach using inductive reasoning.
Counterexample	Example for which conjecture is incorrect.
Point	A location. Has no size. Named by a capital letter.
Line	Series of points that extend in two opposite directions without end. Named by any two points on the line.
Collinear points	Points that lie on the same line.
Plane	Flat surface with no thickness.
Coplanar	Points and lines in the same plane.
Postulate	Accepted statement or fact.
Segment	Part of a line consisting of two endpoints and all points in between.
Ray	Part of a line consisting of one endpoint and all the points on the line on one side of the endpoint.
Opposite rays	Two collinear rays with the same endpoint.
Parallel lines	Coplanar lines that do not intersect
Skew lines	Lines that are noncoplanar
Midpoint	Halfway between the two endpoints of a segment
Equidistant	A point that is the same distance from two or more points.
Concurrent	Three or more lines all passing through the same point.
Perpendicular Lines	Two lines that intersect to form right angles.
Perpendicular Bisector	Line, segment, or ray that is perpendicular to the segment at its midpoint.
Angle Bisector	Ray that divides an angle into two congruent coplanar angles. Endpoint is the angle bisector.
Theorem	The statement that you prove true.

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