They are both shapes and an octagon can be made up of six or more triangles. Other than that they are not similar. A triangle must have three sides. An octagon must have eight sides.
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An octagon has 8 sides whereas a triangle has only 3 sides
Octagon
And octagon is an 8 sided triangle. A hexagon is a 6 side triangle. "Oct" is a prefix that means 8. "Hex" is a prefix that means 6.
An octagon.
It's not