Sec' 1 4 Segments, Rays, Parallel Lines and Planes - PowerPoint PPT Presentation

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Sec' 1 4 Segments, Rays, Parallel Lines and Planes

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Line A series of points that extend in 2 directions without end. ... Notation: 2 capital letters with a line with an arrow on one end of it. ... – PowerPoint PPT presentation

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Title: Sec' 1 4 Segments, Rays, Parallel Lines and Planes


1
Sec. 1 4 Segments, Rays, Parallel Lines and
Planes
  • Objectives
  • 1) Identify segments and rays.
  • 2) Recognize parallel lines.

2
  • Line A series of points that extend in 2
    directions without end.
  • Notation 2 capital letters with a line over
    them.
  • Ex
  • Reads Line AB

AB
A
B
3
  • Segment Is the part of a line consisting of two
    endpoints all the points between them.
  • Notation 2 capital letters with a line over
    them.
  • Ex
  • No arrows on the end of a line.
  • Reads Line segment (or segment) AB

AB
A
B
4
  • Ray Is the part of a line consisting of one
    endpoint all the points of the line on one side
    of the endpoint.
  • Notation 2 capital letters with a line with an
    arrow on one end of it. End point always comes
    first.
  • Ex
  • Reads Ray AB

AB
A
B
5
Same Line
  • Opposite Rays Are two collinear rays with the
    same endpoint.
  • Opposite rays always form a line.
  • Ex

RQ RS
S
Q
R
Endpoints
6
Ex.1 Naming segments and rays.
L
P
Q
  • Name 3 segments
  • LP
  • PQ
  • LQ
  • Name 4 rays
  • LQ
  • QL
  • PL
  • LP
  • PQ

Are LP and PL opposite rays?? No, not the same
endpoints
7
  • Parallel Lines Are coplanar lines that never
    intersect.
  • Coplanar same plane
  • Symbol //
  • Ex r // t
  • Reads line r is parallel to line t.

r
t
8
  • Skew Lines Are noncoplanar lines that never
    intersect.
  • Skew lines are never //
  • Parallel Planes Are planes that do not
    intersect.

E
A
H
D
F
B
G
C
9
What have we learned??
  • Name the following line.
  • Name a segment.
  • Name a ray.

XY or YZ or ZX
Z
XY or YZ or XZ
Y
XY or YZ or ZX or YX
X
10

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