AUGUST 24, 2010 Linear Measurement. Bellringer  Put your name on your homework and pass it to the front.  What is ¾ + 5/6 ?

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Presentation transcript:

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 measurement Inches

 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

Segment Addition Postulate  If M is between P and Q, then PM+MQ=PQ PM 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. L M N

 Partner B, Find LN, if LM= in and MN=2 ½ in. L M N

Scribe and Sage

Find x and ST if T is between S and U, ST=7x, SU=45, and TU=5x-3 UTS 7x5x-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?

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