1-2 Segments and Their Measures
RULER POSTULATE: The distance between A and B (AB or
length) can be determined by x2 - x1
or x1 - x2
A
B
x1
x2
Find each length.
A
-2
0
B
C
1
3
BC = ________
AC = ________
Congruent Segments:
Activity: 3 students
between:
Segment Addition Postulate:
If B is between A and C, then AB + BC = AC
If AB + BC = AC, then B is between A and C
A
B
C
3x - 5
17
N
M
5x + 2
Find NO.
O
Activity:
Marker
Ruler
Wax Paper
midpoint:
bisects:
segment bisector:
Ex.
The map shows a route for a race. You are at X, 6000 ft from the first
checkpoint C. The second checkpoint D is located at the midpoint
between C and the end of the race Y. The total race is 3 miles. How far
apart are the 2 checkpoints?
X
C
D
Y
D is the midpoint of EF, ED = 4x + 6, and DF = 7x - 9. Find
ED, DF and EF.