Segment MeasureLT: I can find and compare the lengths of segments.

Term 1. Ruler postulate

The real number that corresponds to a point is called the coordinate of the point.

The distance between points A and B is the absolute value of a minus b.

Term 2.Distance on a Number Line

1. Example: Find the length of AB.Point A is at 1.5 and B is at 5.

So, AB = | 5 - 1.5 | = |3.5| = 3.5A BC

If B is between A & C, then AB + BC = AC.If AB + BC = AC, then B is between A & C.

Term 3 Segment Addition Postulate

A BC

Ex 2: if DE=2, EF=5, and DE=FG, find FG, DF, DG, & EG.

D EF

G

FG=2

DF=7

DG=9

EG=7

2 52 2

Segments that have the same length.If AB & XY have the same length,Then AB=XY, but AB XY

Term 4. Congruent ( ) Segments

Symbol for congruent

A. Congruent segments are marked by using slash marks. (Look below…AC CB.)

B. The midpoint is the point that divides the segment into two congruent parts. (Look below…C is the midpoint of AB.)

C.A segment bisector is a segment that intersects a line segment at the midpoint. (Look below…DE bisects AB.)

A BC●

D

E