triacontahedron
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.
A double helix
A cube.
decahedron
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.
In science, a three-dimensional oval is called an ovoid. Less formally, a three-dimensional oval shape is called an egg.
then it's a - Dodecahedron
A dodecahedron is a polyhedron with 12 faces.A dodecahedron is a three-dimensional shape having twelve plane faces.