# Geometry Chapter 1 Vocab

## 24 terms

### Acute Angle

An angle whose measure is between 0 and 90 degrees

### Obtuse Angle

An angle whose measure is between 90 and 180 degrees

### Parallel Lines

Lines that lay in the same plane but do not intersect

### Ray

A part of a line, with one endpoint, that continues without end in one direction

### Supplementary Angles

2 angles whose sum is 180 degrees

### Coplanar

Figures in the same plane

A location

### Line

A series of points that extend in a 2 opposite directions without an end

### Straight Angle

An angle whose measure is 180 degrees

### Right Angle

An angle whose measure is 90 degrees

### Collinear

Points that lie on the same line

### Complimentary Angles

2 angles whose sum is 90 degrees

### Plane

A flat surface that has no thickness; Contains many lines and extends without and end in the directions of it's lines

### Segment

Part of a line consisting of 2 points, called endpoints, and all the points between them

### Perpendicular Lines

Lines that intersect to form right angles

2 coplaner angles that have a common vertex, but do not share common interior points

### Congruent

Angles that have the same measure

### Transversal

A line that intersects 2 parallel lines

### Opposite Rays

two collinear rays with the same endpoint. They always form a line.

### Skew Lines

noncoplaner lines; therefore, they are not parallel and do not intersect.

### Parallel Planes

planes that do not intersect

### Midpoint

a place in a segment that divides the segment into 2 congruent or equal segments

### Angle

formed by 2 rays with the same endpoint.

### Vertical Angle

Two angles who's sides are opposite rays