1.2 Linear Measure and Precision

Objectives

Measure segments and determine accuracy of measurements.

Compute with measures.

Textbook Pages 13 - 19

Important Terms Line segment: A line segment can be

measured, because it has two endpoints. Precision: The measurement should be

precise within 0.5 units of measure.

Ex: if cm is smallest unit, can come w/in ±.5 cm for precision

Ex: if mm is smallest unit, can come w/in ± .5 mm

Examples

Find the precision for the measurement:1. 5 mm 2. 8 ½ inches

Important Terms

Between: A Point M is between points P and Q if and only if P,Q, and M are collinear and PM + MQ = PQ. (Point M DOES NOT have to be a midpoint)!

Congruent: When segments have the same measure, they are said to be congruent.

Examples

2

2

AB

C

Find AC:

R P Q2y 21

Find RQ:

Congruent ( ) – items with same measure (use in geom figures instead of “=“)

A

B

C

D

E

F

Assignment

Worksheet Skills Practice 1-2.