1.2 points, line segments, lines and rays…oh my!
DESCRIPTION
1.2 Points, Line Segments, Lines and Rays…OH MY!. Mental Math. Solve these subtraction problems. Write your answer on your slate. 9 – 0 = 12 – 6 = 16 – 9 = 17 – 8 = 90 – 40 = 140 – 70 =. Math Message. Read SRB pages 88 and 89 . - PowerPoint PPT PresentationTRANSCRIPT
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1.2 Points, Line Segments, Lines and
Rays…OH MY!
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Mental Math
Solve these subtraction problems.
Write your answer on your slate.
9 – 0 =
12 – 6 =
16 – 9 =
17 – 8 =
90 – 40 =
140 – 70 =
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Math Message
Read SRB pages 88 and 89.
In your Math Notebook, please list three places where geometry can be found in our
world.
Be ready to share.
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Reviewing Points, Line Segments, Lines and Rays
A B
points
When you connect two
points using a straightedge, you
create a
line segment
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Points, Endpoints and Line Segments
A B
line segment• letters are often used to name a line segment
• ONE name for this line segment is “line segment AB”
• A short way to write “line segment AB” is AB
• Another name for this line segment is “line segment BA”
• What is the short way to write “line segment BA?”
endpoint
endpoint
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Stop and Chat!
A BHow would you describe a line segment
to someone who has never seen one before?
What are some examples of line segments that we can find in the world?
EXAMPLE: part of a spider web
endpoint
endpoint
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Lines
A B
lines• extending line segment AB in both directions and drawing an arrowhead at each end makes a LINE
• This line is called “line AB” or “line BA”
• A short way to write the names of these lines is
AB or BA
point point
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Stop and Chat!
A B
point point
How is a line different from a line segment?
What are some examples of lines that we can find in the world?
EXAMPLE: The horizon in a landscape
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Ray
C D
rays• line segment that goes on without end in only ONE
direction
• Point C is the ENDPOINT of the ray CD
• The letter that names the ENDPOINT is ALWAYS
written first.
Short way to write the name is CD
endpoint
point
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Stop, Try and Chat!
C D
On your slate, draw ray ZY. Remember that the endpoint of the ray is ALWAYS
written first.
What are some examples of lines that we can find in the world?
Example: Hitting a golf ball
endpoint
point
Short way to write the name is CD
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Let’s Review!Is it ever possible to draw all of a line?
All of a line segment? All of a ray?
How many line segments can you name using the points marked on this line?
How many rays can you name?
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Independent work MJ page 4
You can use SRB pages
90 and 91 to help you!
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Wrap it UP!
In your Math Notebook…
Draw and label YX
Draw and label HG
Draw and label VB
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Addition Top-It
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Tonight’s Homework
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Math Boxes