1.4 Segments, Rays, Parallel Lines and
Planes
“I have always grown from my problems and challenges.”
-Carol Burnett

Terms
A segment is the part of a line consisting of two endpoints and the points between them.
A ray is one endpoint and all of the points on one side of the endpoint.
Opposite rays are two collinear rays with the same endpoint.
Opposite rays always form a line.
A B

Naming
Name the segments and rays.
Three segments:
B
A
Four rays:

More Practice
1) Another way to name EF.
2) Are EG and GE the same line?
3) Are EG and GE the same ray?

True or False

Terms
Parallel lines are coplanar lines that do not intersect.
Skew lines are noncoplanar ; (these lines do not intersect)

Terms
Parallel planes are planes that do not intersect.
A
*Note: A line and a plane that do not intersect with each other are also parallel.
G
H
Examples:
1) Identify two parallel planes.
C
B
J
D
I
2) Identify a plane and a line that are parallel.

Linear Equations Review
Solve the following equations.
1) ( 4 w

28 )

( 11 w

13 )

180 2) 8 x

4

2 x
 
10
3) 7 t

8 t

4

5 t

2 4) ( 6 a

54 )

( 5 a

27 )

23

1.4 Segments, Rays, Parallel Lines and
Planes
HW:p.25 #4-15, 16-22 EVEN, p.30 #1-19 ODD (linear equations review)
THT: Can do 1-7, 9-10
Terms: segment, ray, opposite rays, parallel lines, skew lines, parallel planes