Answers to Homework
2) True
4) True
6) False
8) False
10) True
14) No
16) *Plane VST and RSTW 18) *VS *Plane VWT
22) *AE ER EH
24) a) No b) Yes
26) * a) Plane ABFRE Plane DCGSH
b) Plane EHDA
Plane FGCB
28) a) Yes b) No *ORDER MAY VARY
1-3 Segments, Rays, and Distance
Vocabulary

Segment: A line that has 2 end points

EG
Ray: A line that has 1 end point
E
R

G
S
RS
Opposite Rays: Two rays going in opposite
directions with the same end point
Makes a line!
Distance


Space between 2 numbers on a number line
The absolute value of the difference of 2
coordinates
| 1  4 | |  3 | 3
Examples:
Find the distance between 1 and 4.
Find the distance between -2 and 3.
|  2  3 | |  5 | 5
Segments

Congruent: Same size and shape (equal)

AB  CD
Congruent Segments: segments with equal
length
B
C
A
AB  CD
Lengths are equal
No line = Length
AB = 3 in
D
More Segments


Midpoint of a Segment: a Point that divides a
segment into two congruent segments
Bisector of a Segment: a Line, Segment,
Ray or Plane that intersects a segment at its
midpoint
F is the midpoint of EG
EF  FG
EF  FG
E
M bisects EG
F
G
M
Segment Addition Postulate

If B is between A and C, then AB + BC = AC
Example: Given RS = 3x, ST = 12 – x, and
RT = 24, find x.
R
S
T
3 x  12  x  24
x6
TOO

Given E is the midpoint of DF, DE = 4x – 3
and EF = 3x + 2, find x.
D
E
4x  3  3x  2
x 5
F
Homework

Page 15 #1-39 odd
–

Show work whenever possible
Flash Cards
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–
–
–
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Segment
Ray
Opposite Rays
Distance
Congruent
– Midpoint of a Segment
– Bisector of a Segment
– Segment Addition Postulate