Classifying Triangles by Side Lengths

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Classifying Trianglesby Side Lengths
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• Scalene Triangles each side is a different
  length

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Isocelese Triangle 2 sides of equal lengths
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Equilateral Triangle- All sides are congruent
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Activity

• Measure pipe cleaners to the following lengths
  2 in., 3 in., 7in., 8in.
• Form triangles with the pipe cleaners
• Tell me 2 combinations that will form triangles
• Tell me 2 combinations that will not form
  triangles

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The Sum Of Any Two Sides of A Triangle Must
be Greater than The Third Side
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Examples

• Can I make a triangle out of sides that are 4 in,
  8, 10.

Is the sum of the smallest 2 sides greater than
the 3rd side.
4 8 12
12 gt 10
yes, it is a triangle
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• Can you make a triangle out of 3m., 6m., 19m.

Is the sum of the smallest 2 sides greater than
the 3rd side.
3 6 9
9gt 19
No, 9 is not greater than 19
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Assignment

• Take the following numbers and give me 4
  combinations of numbers that will form triangles
  and 4 that will not form a triangle.
• 2, 5, 6, 10, 14, 23