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Points, Lines, and Planes. A point is an exact location in space. You are here. A true point has no length, no width, and no height. In fact, you cannot see a true point. A point is named by a letter. Point P. P.

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A true point has no length no width and no height
A true point has no length, no width, and no height.

In fact, you cannot see a true point.



Lines are 1 dimensional objects that have only length lines continue forever in both directions
Lines are 1-dimensional objects that have only length. Lines continue forever in both directions.





A ray of light has a starting point like the sun and continues forever in the same direction
A ray of light has a starting point (like the sun) and continues forever in the same direction.



A ray is also defined by 2 points
A ray is also defined by 2 points. absorbed or reflected.

C

D

Ray CD



A line segment also defined by 2 points
A line segment also defined by 2 points. Line segments can be measured.

E

F

Line Segment EF


Lines can do various things
Lines can do various Line segments can be measured.things.


Lines can intersect at a point to form angles
Lines can intersect at a point to form angles. Line segments can be measured.

X

Y

Z




Lines can be parallel
Lines can be parallel. be perpendicular.




Believe it or not this is possible let s consider a 3 dimensional rectangular prism
Believe it or not, this is possible. parallel either?Let’s consider a 3-dimensional rectangular prism.





A skewer raises your “dinner” off the surface of the grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.


Lines can be
Lines can be… grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.

intersecting

skew

parallel

perpendicular

90º


A plane grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.

is a flat

surface that has

length & width

but no height.


You can see a plane only if you view it at a certain angle
You can see a plane only if you view it at a certain angle. grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.


A true plane goes on forever in all directions
A true plane goes on forever in all directions. grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.


A true plane goes on forever in all directions. grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.


A true plane goes on forever in all directions. grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.


A true plane goes on forever in all directions. grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.


A true plane goes on forever in all directions. grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.


Planes can
Planes can… grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.


Planes can grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.

intersect.


An x wing fighter from star wars has wings that intersect
An X-Wing fighter from Star Wars has wings that intersect. grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.


Planes can grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.

be perpendicular.


Planes can grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.

be parallel.


A tie fighter from star wars has wings that are parallel
A Tie Fighter from Star Wars has wings that are parallel. grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.


Planes can be
Planes can be… grill. The skewer does not intersect the grill, and the skewer is not parallel to the grill.

intersecting

parallel

perpendicular


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