2D - Nonagon 3D - Nonahedron
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Shapes that have four sides are known as quadrilaterals.
No, octagons just have to be closed shapes with eight sides - the sides do not have to be of equal length.
Any regular shapes have equal sides, including squares and equilateral triangles. Irregular shapes can also have equal sides, but not equal angles.
Triangles have 3 sides.
triangles