Such a shape cannot exist because it is always possible to increase the number of sides by 1 by simply cutting off one vertex.
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No 3D shape with FLAT SIDES has exactly 3 faces. 4 is the minimum.
A 3d shape with 10 sides is called a decahedron. I have added a link with some pictures of them. As you can see they look very different but all have 10 sides or faces.
-3
I'm not certain, but i believe it would be a nonadecanonahedrinnonadaca- is 19decanona- is 90hedrin- is a 3d figure
A Circle if you mean 2d circle, 3d sphere =P Any continuously curves shape has no sides; ellipse (ellipsoid), cone, hyperbolic paraboloid...