Chapter 1 Section 2

 Students will understand basic terms and postulates of Geometry.

 A specific location in space  It has no size, width, or depth  It is named by a Capital Letter

 An infinite collection of points in a straight path that extends forever in two directions.  Has no size, width, or depth  It is named by any two points on the line or by a lower case cursive letter.

 A flat surface that extends forever without end in four directions.  It is named by a any three points on the plane or by a capitol cursive letter.  It has no size, width, or depth

 Points on the same line  Can be used to name the line

 On the same plane  Remember: a plane contains an infinite number of points and lines.

 Look at Problem 1  Try the “Got It” problem for this example.

 The set of all points in three dimensions.  It contains the universe =)

 Part of a line  It has a definite beginning and an end  It is named by its two endpoints. AB

 Half of a line  It extends forever in one direction and has one endpoint.  It is named by its endpoint and any other point on the ray. A B

 Two rays that share the same endpoint and extend in opposite directions  It makes a line

 Look at Problem 2…  Try the “Got It” Problems

 An accepted statement of fact  Also known as an axiom  Basic building block of Geometry

 Through any two points there is exactly one line

 The set of points two figures have in common  Where the two figures overlap

 Two lines intersect at a point

 Two planes intersect at a line

 Look at Example 3…  Try the “Got It” problem for that example.

 Through any three noncollinear points there is exactly one plane

 Look at Example 4…  Try the “Got It” problem for that example

 Try Problems #1-7 on your own.  Raise your hand when you have completed them.