Shapely Spider Webs

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Shapely Spider Webs
The Math Science Center
presents

• By Susan L. Cerruti

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Lets Look at a REAL Spider Web
THINK!

• What shapes do you see?

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What We Know
A triangle has 3 sides and 3 corners.
A square or rectangle has 4 sides and 4 corners.
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Same Thing, Different Name
line segment
side
corner
angle
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The Point Is
A point is formed when two lines intersect.
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Terms
_______________.
A line segment is
the straight line between two points.
An angle is
_________________.
made when two line segments intersect at a point.
this special point at an angle is called a VERTEX
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Lets Put it Together
angle
line segment
point
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Find the points, line segments and angles of
these shapes.
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Lets Look at How a Spider Spins a Web.
THINK!

• What do we see at each stage?
• What shape is the web?
• What shapes do we see inside of the web?

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The spider begins with one simple LINE SEGMENT.
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These 3 LINE SEGMENTS form the 3 SIDES of a
triangle.
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The same LINE SEGMENTS also intersect at a POINT
to form ANGLES.
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The final productwhat do we see now?
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Make Your Own Geoboard Web Using Your Rubber Bands

• THE RULES
• 3 to 10 rubber bands
• no more than 2 rubber bands on one point
• bands should not cross
• your shape must be closed

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Examples
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Examples
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Transfer Your Web

• Copy your shape onto the graph paper.
• Use the numbers on your geoboard and recording
  sheet to help you.

x
8 7 6 5 4 3 2 1 0
8 7 6 5 4 3 2 1 0
x
x
x
0 1 2 3 4 5 6 7 8
0 1 2 3 4 5 6 7 8
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Your Web

• Find and count line segments.
• Find and count points angles.
• Measure each.

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Be Sure to Measure from the 0 on Your Ruler!
0
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This Side of the Triangle is 7 Inches Long.
Write your measurement along the line segment.
7 in.
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What Did We Learn?

• What did you learn about your web?
• What did you learn about points, line segments
  and angles?
• Were they the same or different?
• Is there a pattern?

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Thank You!
Questions?