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Lesson 9.1 Points, Lines, and Planes

Lesson 9.1 Points, Lines, and Planes. Point. A point is a location in space. Has no size Notation: A. Line. A series of points that extends in two directions without an end A line can be named with a lower case letter or two points with the line above Notation: . A. B. Plane.

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Lesson 9.1 Points, Lines, and Planes

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  1. Lesson 9.1 Points, Lines, and Planes

  2. Point • A point is a location in space. • Has no size • Notation: A

  3. Line • A series of points that extends in two directions without an end • A line can be named with a lower case letter or two points with the line above • Notation: A B

  4. Plane • A flat surface with no thickness • Notation:ABCD (vertices) or Capital letter

  5. Line Segment or Segment • A part of a line • Has two end points • Notation: Q P

  6. Ray • Part of a line that has exactly one endpoint. • Name its endpoint first. • Notation: C R

  7. Point Q - Designates a position. Q - At least two points determine a line. P T - Rays have exactly one endpoint. - Three non-collinear points determine a plane. Plane QPT - Line segments have exactly two endpoints.

  8. B B A A D C C D Parallel Lines - Lines in the same plane that do not intersect. Intersecting Lines

  9. Skew • Lines that do not lie in the same plane. • They are not parallel and do not intersect. • Skew segments must be parts of skew lines. N P R M S T V

  10. Homework Page 445 (1-21) all

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