20 terms

# Chapter 1 PH Geometry Vocabulary

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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.