# What do we call a 3d shape with 12 sides

Its 30 edges are divided into two sets — containing 24 and 6 edges of the same length. In block capitals , the letters E , H and X and I in a slab serif font have dodecagonal outlines.

If you cut a prism anywhere along its length, parallel to an end, its cross-section is the same - you would end up with two prisms. The sides of a prism are parallelograms - four-sided shapes with two pairs of sides with equal length. Antiprisms are similar to regular prisms, their ends match. However the sides of anti-prisms are made up of triangles and not parallelograms. Antiprisms can become very complex.

Although we tend to think of pyramids with a square base, like the ones that the ancient Egyptians built, they can in fact have any polygon base, regular or irregular. Archimedean solids, for example, are made up of at least two different regular polygons. The truncated cube as illustrated is an Archimedean solid with 14 faces. The shape has 36 edges and 24 vertices corners.

Solid shapes which include a curved or round edge are not polyhedrons. Polyhedrons can only have straight sides. Many of the objects around you will include at least some curves. In geometry the most common curved solids are cylinders, cones, spheres and tori the plural for torus. Our page on Calculating Area explains how to work out the area of two-dimensional shapes and you need to understand these basics in order to calculate the surface area of three-dimensional shapes. For three-dimensional shapes, we talk about surface areato avoid confusion. You can use your knowledge about the area of two-dimensional shapes to calculate the surface area of a three-dimensional shape, since each face or side is effectively a two-dimensional shape.

As with flat shapes, the surface area of a solid is expressed in square units: You can find more detail about units of measurement on our page Systems of Measurement. The surface area of a cube is the area of one face length x width multiplied by 6, because all six faces are the same. Name of Geometric Shapes - dCode. You have a problem, an idea for a project, a specific need and dCode can not yet help you? You need custom development?

### Name of Geometric Shapes

Team dCode read all messages and answer them if you leave an email not published. It is thanks to you that dCode has the best Name of Geometric Shapes tool. A regular dodecagon can fill a plane vertex with other regular polygons in 4 ways:.

Here are 3 example periodic plane tilings that use regular dodecagons, defined by their vertex configuration:.

**List of polygons**

A skew dodecagon is a skew polygon with 12 vertices and edges but not existing on the same plane. The interior of such an dodecagon is not generally defined. A skew zig-zag dodecagon has vertices alternating between two parallel planes. A regular skew dodecagon is vertex-transitive with equal edge lengths. The regular dodecagon is the Petrie polygon for many higher-dimensional polytopes, seen as orthogonal projections in Coxeter planes.

Examples in 4 dimensionare the cellsnub cellduoprismduopyramid. In 6 dimensions 6-cube6-orthoplex2 211 It is also the Petrie polygon for the grand cell and great stellated cell. There is one regular star polygon: There are also three compounds: Catalan solids duals of Archimedean. Fundamental convex regular and uniform polytopes in dimensions 2— Retrieved from " https: Planar graphs Individual graphs Platonic solids.

## What is an 11 an d 12 sided shape called?

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A pyritohedron has 30 edges, divided into two lengths: Regular star, great stellated dodecahedronwith pentagons distorted into regular pentagrams. Concave pyritohedral dodecahedron is called a endo-dodecahedron and can tessellate space with the convex regular dodecahedron. A cube can be divided into a pyritohedron by bisecting all the edges, and faces in alternate directions.

The geometric proportions of the pyritohedron in the Weaire—Phelan structure. A regular dodecahedron is an intermediate case with equal edge lengths.