1­2 Linear Measure and Precision.notebook
September 10, 2013
9/10 Honors Geometry Warm­up
1. How far away are you from Paris?
2. On a ruler, what is the smallest labeled unit?
* The length of a segment is only as precise as the smallest unit on the measuring device.
1­2 Linear Measure and Precision.notebook
September 10, 2013
1­2 Linear Measure and Precision.notebook
September 10, 2013
1­2 Linear Measure and Precision
Line segment: Length of a line segment:
Congruent Segments: two segments have the same ____________
Notation for congruent segments:
(Red slashes on figure indicate that segments are congruent)
1­2 Linear Measure and Precision.notebook
September 10, 2013
• The ________________ of any measurement depends on the smallest unit available on the measuring tool. • The range of error in the measurement is called the ___________________ and can be expressed as ________. Examples: Find the precision for each measurement
1. 10 inches
2. 44 cm
3. 3.5 mm
4. ft
1­2 Linear Measure and Precision.notebook
September 10, 2013
Activity:
1. Measure the height of your desk in metric and customary units. 2. What is the precision in each case?
3. Which precision is "better"?
1­2 Linear Measure and Precision.notebook
September 10, 2013
Betweenness of Points (Segment Addition Postulate): Point M is between points P and Q if and only if P, Q, and M are ________________ and PM + MQ = _________. 1. Find the measurement of each segment. Assume the figures are not drawn to scale.
2. Find x and RS if S is between R and T.
1­2 Linear Measure and Precision.notebook
3. Use the figure to determine whether September 10, 2013
is congruent to .