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Well, that depends on what you mean by shape and side.

In a plane, any 2 dimensional figure that has 8 sides is an octogon. Each side is a straight line segment. It doesn't matter if the sides are all the same length or not.

If you are working in 3 dimensional space, then the answer is an octohedron. In this case, the side is a plane figure (a triangle). The regular octohedron is one of the 5 platonic solids, once thought by the ancients to comprise the fundamental building blocks of matter.

Q: What shap that has 8 sides?

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octagon

decagon

A kite and an arrow head are 2 of them

triangle.

A pentagon or an irregular pentagon if the sides are unequal in length.

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octagon

a quadrilateral

hexagon

An octagon.

decagon

A kite and an arrow head are 2 of them

Hexagon

triangle.

I would call (not cal) an 8 faced shape (not shap) an octahedron.

A nonagon has 9 sides

a crescent has 19 sides

A pentagon or an irregular pentagon if the sides are unequal in length.