Geometry 1.2 Points. Lines and Planes

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 M S B R

If we get a lot of points together and they are straight we make a line! BCSPML

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 ABSVKT

What Lines Look Like M S G d

Vocabulary Collinear = points on the same line Noncollinear = Not on the same line

Collinear/Noncollinear M S G d l HQ

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 CBKMUV

What do rays look like K V U M C 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 BHDGPV

What do Line segments look like K V U M C 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 ABCJKM R

More Vocabulary Coplanar = points on the same Noncoplanar = Not on the same plane plane

What do planes look like K V U M C R