A 2D seven sided figure is called a heptagon. A 3D seven faced polygon is called a heptahedron.
A triangular dipyramid.
A dodecahedron.
It's a pentagonal prism or a hexagonal pyramid. (maybe there are other answers)
a 4 sided 3d shape is called a triangular prism!!!!!!!!!!!!!!!
3d shapes with six faces are called hexahedra.
A 2D seven sided figure is called a heptagon. A 3D seven faced polygon is called a heptahedron.
A triangular dipyramid.
Dodecahedron
A dodecahedron.
A 12 sided 3D shape is called a dodecahedron.
pentagonal pyramid
It's a pentagonal prism or a hexagonal pyramid. (maybe there are other answers)
An 11-sided 3D shape is a hendecahedron.
I believe it is tridecahedron.
A 14-sided and 3-dimensional shape is called either a tetrakaidecahedron or tetradecahedron. This 14-sided polyhedron can have six quadrilateral and eight hexagonal faces.
2D is a decagon. 3D is a decahydron.