1.3+Segments

=1.3 Segments and Their Measures= Textbook Pages: 17-25

In this section, you will learn about how to measure segments. In order to do this, you are going to learn about two different postulates. (Ruler and Segment Addition)

__Ruler Postulate__ The points on a line can be matched, one-to-one, with the set of real numbers. The real number that corresponds to a point is the coordinate of the point. The distance, AB, between two points, A and B, on a line is equal to the absolute value of the difference between the coordinates of A and B.



__Segment Addition Postulate__

If a point lies between the two endpoints, both parts will equal the whole segment. For example, if B is between A and C, then AB + BC = AC.

Vocabulary:
//Postulate/Axiom//- In geometry, rules that are accepted without proof. //Theorum//- Rules that are proved. //Coordinate//- The real number that corresponds to a point. //Congruent Segments//- Segments that have the same length.

Online Practice Problems

Here are some more websites to help you with this topic. Ruler Postulate Help: http://www.freemathhelp.com/forum/viewtopic.php?f=10&t=36492 Segment Addition Postulate Help: http://www.course-notes.org/Geometry/Segments_and_Rays/Segment_Addition_Postulate