In geometry, a hendecagon (also undecagon or endecagon) or 11-gon is an eleven-sided polygon.
A polyhedron with 20 faces is called an icosahedron.
nonahedron
An octahedron, which looks like 2 pyramids glued bottom to bottom.
A one-hundred sided polyhedron is called a hecatohedron, comming from the Greek Hecto- meaning one-hundred and -hedronmeaning a three-dimensional figure.
A 20-sided polyhedron is called an icosahedron. It has 20 equilateral triangle faces, 30 edges, and 12 vertices. It is a regular convex polyhedron with rotational symmetry.
Octohedron
I believe it called a Bucky Ball. After Buckminster Fuller.
11-sided QuadrilateralAn 11-sided quadrilateral is called a hendecagon.
a polyhedron (if the shape is 3 dimensional) a polygon if it is a planar shape.
A 120-sided polyhedron is a hecatonicosahedron.
An 11 sided figure is called a hendecagon, an undecagon, or a 11-gon.
A 2D seven sided figure is called a heptagon. A 3D seven faced polygon is called a heptahedron.