# Chapter 1 PH Geometry Vocabulary

### 20 terms by psullivan69

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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.

Example: