Section 1-3: Segments, Rays, Parallel Lines, Planes SPI 32A: Identify properties of plane figures

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Section 1-3 Segments, Rays, Parallel
Lines, Planes SPI 32A Identify properties of
plane figures

• Objectives
• Identify segments and rays
• Recognize parallel lines

Review Vocabulary
Point Designates a location, has no size,
named by a capital letter Line Series of
points that extends in 2 opposite direction
without end Space A set of all points. Plane
Flat surface with no thickness contains many
lines Collinear Points Points that lie on the
same line
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More Vocabulary
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Segment
Part of a line consisting of two endpoints and
all points in between. (Segment AB or BA)
Definition
How to sketch
How to name
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Ray
Definition
Part of a line consisting of one endpoint and all
the points of the line on one side of the
endpoint. When naming, endpoint must be listed
first. (AB and BA are not the same)
How to sketch
How to name
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Opposite Rays
Definition
Two collinear rays with the same endpoint.
Opposite rays always form a line.
( Opposite rays must have the same endpoint )
opposite rays
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Naming Segments and Rays
Name the segments and rays in the figure.
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Vocabulary (cont)
Parallel Lines
Definition
Coplanar lines that do not intersect
Skew lines
Definition
Noncoplanar (they do not lie in the same flat
surface), therefore they are not parallel and do
not intersect.
Parallel Planes
Definition
Planes that do not intersect.
Plane KLQP II plane NMRS
Plane KLMN II plane PQRS
Plane PKNS II plane QLMR
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Naming Parallel and Skew Lines
Use the figure below. Name all segments that are
parallel to AE. Name all segments that are skew
to AE.
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Vocabulary (cont)
A
Perpendicular Lines
D
C
B
Definition
Lines which intersect to form a right angle (90)
Midpoint
A
B
C
Segment with midpoint B.
Definition
Divides a line segment into two congruent (equal)
segments.
Intersect
Definition
Crossing or sharing a point
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A street map can be thought of as a series of
parallel, intersecting, and skew segments.
Name a street that is parallel to Park Street.
Name a street that intersects State Street.
Name a street that intersects Hemlock Avenue.
Will a car traveling on Hill Street ever meet a
car traveling on Crosstown Road? Explain.
Name all streets on the map that are parallel to
State Street.
Enrichment 1-3