No 3D shape with FLAT SIDES has exactly 3 faces. 4 is the minimum.
-3
I'm not certain, but i believe it would be a nonadecanonahedrinnonadaca- is 19decanona- is 90hedrin- is a 3d figure
Decahedreon
A Circle if you mean 2d circle, 3d sphere =P Any continuously curves shape has no sides; ellipse (ellipsoid), cone, hyperbolic paraboloid...
2D shape = Decagon 3D shape = Decahedron
A 3d shape can have infinite sides
sides are the face of a 3d shape and verticies are the corner of the shape
square
That is a Dodecahedron.
A septadecahedron has 17 sides to it.
Pentadecagon; Pentakaidecagon
dodecahedron
triangular pyramid.
Tetrahedron
Dodacohedron, I think.
Icosahedron