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1-2 Linear Measure

+VocabularyLine Segment- unlike a line, a segment can

be measured because it has 2 endpoints

Betweenness of points- There is always a point that lies between two other points on any line

Congruent Segments- segments that have the same measure

Constructions- methods of creating geometric figures without the benefit or measuring tools

+Examples

1 and 11/16 inches

4 and 1/5 cm

+Examples Find the measure of each segment:

18.4 + 4.7 = 23.1 cm

€

23

8+11

4=19

8+5

4

€

=19

8+10

8=29

8

100 - 89.6 = 10.4 cm

+Practice

5 ½ cm

2 ¼ in

+Practice

1 + 1 ¼ = 2 ¼ in

4.9 + 5.2 = 10.1 cm

15 – 9.7 = 5.3 mm

+Examples

6. JK = 6x , KL = 3x , JL = 27

7. Are the following congruent?

J K L

JK + KL = JL6x +3x = 279x = 27x = 3

Yes, because of the single tic marks on each segment

+Practice

6. JK = 2x, KL = x+2 , JL = 5x-10

7. Are the following congruent?

JK + KL = JL2x +x+2 = 5x-103x + 2= 5x – 1012 = 2x6 = x

J K L

No, TU is 2 ft, SW is 3 ft