Between

1
Between
Definition X is between A and B if AX XB
AB.
AX XB AB
Notice that this does not say X is in the middle
of A and B it is just somewhere between A and B.
Therefore AX may not equal XB
2
The Segment Addition Postulate
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.
2x
x
Step 1 Draw a figure
Step 2 Label fig. with given info.
x 4 AC 4 CB 8
Step 3 Write an equation
Step 4 Solve and find all the answers
3
Congruent Segments
Definition
Segments with equal lengths. (congruent symbol
)
Congruent segments can be marked with dashes.
Correct notation
Incorrect notation
4
Segment Bisector
Any segment, line or plane that divides a segment
into two congruent parts is called segment
bisector.
Definition