a polyhedron * * * * * That is only if it is bounded by plane faces. A sphere, for example, is a three dimensional shape but is not a polyhedron: it is a solid shape.
decahedron
triacontahedron
An oval is two-dimensional. An ovoid is a three-dimensional shape based on an oval - like an egg,
An egg-shaped, three-dimensional shape is an ovoid.
A two-dimensional shape with three sides is a triangle. A three-dimensional shape with three faces is a cylinder.
a polyhedron * * * * * That is only if it is bounded by plane faces. A sphere, for example, is a three dimensional shape but is not a polyhedron: it is a solid shape.
A cuboid.
There is none you idiot
A double helix
A cube.
decahedron
triacontahedron
sphere
A shape that has 10 sides (two dimensional) is called a decagon. A shape that has 10 faces (three dimensional) is call a decahedron.
An oval is two-dimensional. An ovoid is a three-dimensional shape based on an oval - like an egg,
A sphere is indeed a three dimensional shape. It is a circle rotated about an axis several times to create and three dimmensional object from a two dimensional shape.