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# 1-4 Segments, Rays, Parallel Lines, and Planes - PowerPoint PPT Presentation

1-4 Segments, Rays, Parallel Lines, and Planes. Objectives: Define line segments and rays Properly name line segments and rays Identify parallel lines and skew lines. Line Segments. B. A. A line segment is part of a line containing two endpoints and all points between them.

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Objectives:

• Define line segments and rays

• Properly name line segments and rays

• Identify parallel lines and skew lines

B

A

• A line segment is part of a line containing two endpoints and all points between them.

• Unlike lines, which extend forever in both directions, line segments have a definite beginning and end

• A line segment is named with the endpoints

AB or BA

• A ray is part of a line that consists of one endpoint and all points of the line extending in one direction

• Name a ray using the endpoint first and then another point on the ray

• When naming, make sure the arrow points away from the endpoint.

B

A

AB , not BA

• Are these two rays the same?

B

AB

A

B

A

BA

• No

• Different endpoints

• Extend in different directions

• Are two collinear rays with the same endpoint

• Always form a line

J

K

L

KJ and KL are opposite rays

• Lines that

• Never intersect

• Extend in the same directions

• Coplanar

Lines that:

• Never intersect

• Are noncoplanar

• Extend in different directions

• Parallel planes are planes that never intersect

• Example: the purple planes in the above illustration

• A line and plane that never intersect are also parallel

• Which of the following has no endpoints?

• Ray, Line Segment, Line

• Which of the following has two endpoints?

• Ray, Line Segment, Line

• Which of the following has one endpoint and extends in one direction?

• Ray, Line Segment, Line

• Which of the following extend in the same direction?

• Parallel lines, skew lines

• Which of the following extend in different directions?

• Parallel lines, skew lines

• P. 13-15 All

• P. 253 All

• P. 255 All