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## Geometry 1.2 Points. Lines and Planes

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**Points**• Basic Unit of Geometry • Has no size • Named using capital letters • Points are written as capital letters A, B, C**What Points Look Like**A S B M R**If we get a lot of points together and they are straight we**make a line! B C S P M L**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**What Lines Look Like**d S M G**Vocabulary**• Collinear = • points on the same line • Noncollinear = • Not on the same line**Collinear/Noncollinear**d S l H M Q G**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**What do rays look like**V K M C U V X**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**What do Line segments look like**V K M C U V X**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**More Vocabulary**• Coplanar = • points on the same • Noncoplanar = • Not on the same plane plane**What do planes look like**R V M K C U