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I think you mean OCTAHEDRON. An Octahedron is an 8-sided solid object. It is like two pyramids placed bottom to bottom.
A rectangular solid is a polygon, as it is a four-sided, six face object. In two dimensions, it will remain a polygon with intersecting lines at the interior, with no line exceeding the boudary of the edge of the object from any point of view.
cone
It is the section of a cone between two parallel planes that are perpendicular to the axis of the cone. In simpler terms, it is what is left of a solid cone when the pointed end is cut off.
isosceles triangle