AUGUST 24, 2010

Linear Measurement

Bellringer

Put your name on your homework and pass it to the front.

What is ¾ + 5/6 ?

Unlike a line, a line segment, can be measured because it has two endpoints.

A segment with endpoints A and B can be name AB or BA.

The length or measure of AB is written AB.

Introduction to measurementInches

Centimeters

A standard ruler

Challenge…

With your shoulder partner, find something in the room that is

A) 5 inches B) 3.7 cm C) Measure the length of Partner A’s

pencil/pen in inches D)Measure the length of Partner B’s

pinky finger in centimeters

83

Segment Addition Postulate

If M is between P and Q, then PM+MQ=PQ

P M Q

Two segments having the same measure are congruent ( )

Partners take turns, one solving a problem while the other coaches.

1. Partner A solves the first problem. 2. Partner B watches and listens, checks,

coaches if necessary, and praises. 3. Partner B solves the next problem. 4. Partner A watches and listens,

checks, coaches if necessary, and praises.

Rally Coach

Partner A- Draw DE that is 3 1/16 inches long.

Partner B- Draw FG that is 2 ¾ inches long.

Partner A, Find LM, if MN=2.6 cm and LN=4 cm.

LM

N

Partner B, Find LN, if LM= in and MN=2 ½ in.

LM

N

8

54

Scribe and Sage

Find x and ST if T is between S and U, ST=7x, SU=45, and TU=5x-3

U T S7x5x-3

45

Summary:

What measurement do the little lines on the inch side of a ruler show?

How many divisions are there in a centimeter on a ruler?

What does the angle addition postulate say?

TIME