# Segments, Rays, Parallell Lines and Planes - PowerPoint PPT Presentation

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Segments, Rays, Parallell Lines and Planes. 1-3. Definitions. Segment- a segment is a part of a line which contains two endpoints and all of the points between. Ray- A ray is a part of a line consisting of only one endpoint, and extending infinitely in the opposite direction.

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Segments, Rays, Parallell Lines and Planes

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## Segments, Rays, Parallell Lines and Planes

1-3

### Definitions

• Segment- a segment is a part of a line which contains two endpoints and all of the points between.

• Ray- A ray is a part of a line consisting of only one endpoint, and extending infinitely in the opposite direction.

### Definitions

• Opposite rays- Two collinear rays with the same endpoint. Opposite rays always form a line.

• Parallel lines- two coplanar lines that do not intersect.

### Definitions

• Skew lines- non coplanar lines which do not intersect.

• Parallel planes- planes that never intersect

• Find a pair of parallel lines

• Skew Lines:

• Parallel planes:

• Where does plane ABD and plane EHD intersect?

• Find three segments:

• Find three rays:

• Name the line in three ways:

• Name a pair of opposite rays:

### Homework

• Pg 19 #5-7, 14-31, 55