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1-2 Linear 1-2 Linear MeasureMeasure
Textbook page 13
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Review: Measuring with a Review: Measuring with a rulerrulerFind the length of using each ruler.
cm
in
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Measuring a SegmentMeasuring a Segment
• Segment Addition Postulate: If C is between A and B, then AC + CB = AB.
• Example: If AC = x , CB = 2x and AB = 12, then, find x, AC and CB.
AB
C
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More ExamplesMore Examples
1. Find XY.
2. Find FG.
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Algebraic ExamplesAlgebraic Examples
3. Find x and MN if N is between M and P, MP = 60, MN = 6x - 7, and NP = 2x + 3.
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Congruent SegmentsCongruent Segments
Definition:
AB: the segment AB (an object)
AB: the distance from A to B (a number)
AB
D
C
Congruent segments can be marked with dashes. Also, if the measurements are the same for two segments, then the segments are congruent.
Correct notation:
Incorrect notation:
AB = CD AB CD
AB = CDAB CD
Segments with equal lengths. (congruent symbol: )