5th gr. geometry 1

8/11/2019 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.

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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.

5th gr. geometry 1

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