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
R
A
2
B
2
Find AC:
2y
C
Find RQ:
P 21
Q
Congruent ( ) – items with
same measure (use in geom figures
instead of “=“)
F
B
E
D
A
C
Assignment
Worksheet Skills
Practice 1-2.