lines, rays, and planes
DESCRIPTION
LINES, RAYS, AND PLANES. Lines, rays and planes are all around us. Let’s look at each one and see if we can find examples in our environment. LINES. What are lines?. Lines are long, thin continuous marks. We name and identify lines by using points on the lines. A. F. AF. H. G. GH. - PowerPoint PPT PresentationTRANSCRIPT
Lines, rays and planes are all around us. Let’s look at each one and see if we can find examples in our environment.
What are lines?
Lines are long, thin continuous marks.
We name and identify lines by using points on the lines.
A F
AF
G H
GH
There are 3 main types of lines.
What are parallel lines?
Parallel lines are always the same distance apart and never touch.
Can you name parallel lines in the diagram below?
A B
C
D
E
F
G HAG and BH
CE and DF
What are perpendicular lines?
Perpendicular lines are lines that intersect (cross) and make 4 right angles.
Can you name perpendicular lines in the diagram below?
A
B C
D E
FAF and BC
AF and DE
What are intersecting lines?
Intersecting lines cross one another but never form right angles. Intersecting lines can resemble an ‘X’.
Can you name intersecting lines in the diagram below?
A
F
C
E
D
B
CD and AE
CD and BF
What are rays?Rays are lines that have a definite starting point but no end. Rays continue on endlessly in one direction.
Can you name any rays in the diagram below?
A
F
ED
CB
FA and ED
What is a plane? (We are not talking about the one that flys in the sky).
A plane is a flat surface. It is named by at least 3 points. A
B
C
This is plane ABC.
Look around the classroom. Do you see any planes?
Chalkboard
Top of Desk
Floor
Wall
Ceiling
Door
Window
Book Cover
Paper
Dry Erase Boards
Can you find any parallel lines in the picture?
Are there any perpendicular lines in this picture?
Do you see any intersecting lines in these pictures?
What types of lines do can you find in these pictures?