An octagon is any figure that has 8 sides, no one said that all of the sides had to be the same length.
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An octagon has eight sides that join together.
There is no formula for an octagon. There are formulas for figuring out different aspects of an octagon, such as its perimeter, diameter, etc.
A hexgon has six sides and an octagon has eight.
Pentagon has 5 sides, octagon has 8.
An octogon has 8 sides. A regular octagon is like a stop sign.