Download - 5th Gr. Geometry 1
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Presentation by Connie Burton
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A point is a basic term used ingeometry. You might think of it as
a dot on a piece of paper. It is
usually identified with a capitalletter or number. It has no length
or width. It is used to name an
exact location in space.
1
X
A
YZ
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READ AS Point X
WRITE AS
X
X
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A line is like the line that we might draw
with a ruler. It extends forever in both
directions.
It is named by two points on the line.
This line can be called Line ABor Line
BA.
A
B
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Y
X
READ AS Line XY or Line YX
WRITE AS XY or YX
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A line segmentis like the line that we
might draw with a ruler. It does not
extend forever in both directions. It
has two distinct endpoints.
R
S
It is named by two points on the line.This line segment can be called Line
segment RSor Line segment SR.
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A
B
READ AS Line segment AB or
Line segment BA
WRITE AS AB or BA
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A rayis a straight line that begins at one
point and extends forever in only onedirection.
A
B
It is named by two points on the ray. Thefirst letter mustbe the endpoint. This ray
canonlybe called Ray AB.
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G
H
READ AS Ray GH
WRITE AS GH
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A planeis a flat surface with no end. It is
named by any three points in the plane.
A B
C D
TS
R
This plane could be called:
Plane RST,
Plane TSR,
Plane STR,
etc.
This plane could be called:
Plane ABD,
Plane ACD,
Plane DBC,etc.
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W
Z
X
Y
READ AS Plane WXY or
Plane ZWXWRITE AS no special sho rthand
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Lines that cross at one point are
called intersecting lines.
R
Line RS intersects Line EF at Point M.
E
F
S
M
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READ AS Line FG intersects Line RS at
point CWRITE AS no special sho rthand
F
G
S
R
C
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Intersecting lines are used to connect the
supports on this wharf.
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Intersecting
lines are
used to help
support this
electrical
tower.
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The supports for this building are intersecting lines.
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Many bridges use intersecting lines to help
support them.
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Lines that intersect and form four right
angles are perpendicular lines.
B C
X
Y
Line XY is perpendicular to Line BC.
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R
G
F
S
READ AS
Line FG is perpendicular toLine RS
WRITE AS FG RS
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Highway intersections are often
perpendicular.
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Bridge supports areoften placed in
perpendicular lines.
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Fence supports are
perpendicular to the other
sections.
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Frames of buildings
use perpendicularlines.
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Parallel linesare lines that are equidistant
from each other and will never intersect.
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F
Y
X
G
READ AS
Line FG is parallel to Line YX
WRITE AS FG YX
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The center
lines of a
road are
parallellines. The
two sides of
the roadway
are parallel.
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The fence supports are placed parallel to each
other. The slats of the walkway are parallel.
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The columns supporting this building are placed
parallel to each other.
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Many bridges use parallels to support or
suspend bridges.
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The stripes on our flag are parallel to each other.