Transcript Classifying Triangles by Side Lengths

Classifying Triangles
by
Side Lengths
• Scalene Triangles – each side is a
different length
Isocelese Triangle – 2 sides of equal
lengths
Equilateral Triangle- All sides are congruent
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
The Sum
Of Any
Two Sides
of A
Triangle
Must be
Greater than
The
Third Side
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 > 10
yes, it is a triangle
• 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
9> 19
No, 9 is not greater than 19
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