AUGUST 24, 2010 Linear Measurement. Bellringer Put your name on your homework and pass it to the...

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