6 because there are 1080 degrees in an octagon and 180 degrees in a triangle so 1080/180 = 6 triangles
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An Octogon. You can figure this out on ANY shape by making triangles within the shape Thanks for using Answers.com!
a pentagon has 5 sides, and a octogon has 8 sides, so a octogon has 3 more sides
octogon
A heptagon has 5 triangles.
7 triangles