Geometry 1.2 Points. Lines and Planes - PowerPoint PPT Presentation

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Geometry 1.2 Points. Lines and Planes

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Geometry 1.2 Points. Lines and Planes

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  1. Geometry 1.2Points. Lines and Planes

  2. Points • Basic Unit of Geometry • Has no size • Named using capital letters • Points are written as capital letters A, B, C

  3. What Points Look Like A S B M R

  4. If we get a lot of points together and they are straight we make a line! B C S P M L

  5. Lines • Are made of an infinite number of points • Extend in both directions FOREVER • Named by two points on the line • Or with a lowercase cursive letter • The name is written with a symbol AB SV KT

  6. What Lines Look Like d S M G

  7. Vocabulary • Collinear = • points on the same line • Noncollinear = • Not on the same line

  8. Collinear/Noncollinear d S l H M Q G

  9. Rays • Are lines that end on one side • Extend in one direction FOREVER • Named by the endpoint and one other point on the ray • The name is written with a symbol CB KM UV

  10. What do rays look like V K M C U V X

  11. Line Segment • The chunk of line between two points • Could be part of a line or ray or alone • Named by the endpoints • The name is written with a symbol BH DG PV

  12. What do Line segments look like V K M C U V X

  13. Plane • Flat surface • Extends FOREVER • Named by three points in the plane • Or by an uppercase cursive letter • The name is written like this ABC JKM R

  14. More Vocabulary • Coplanar = • points on the same • Noncoplanar = • Not on the same plane plane

  15. What do planes look like R V M K C U

  16. 1.23-27