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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