Q: What is a 3d shape with 20 sides called?

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Tetrahedron

A 3d shape can have infinite sides

A triangular dipyramid.

sides are the face of a 3d shape and verticies are the corner of the shape

A septadecahedron has 17 sides to it.

Related questions

the name of a 20 sided 3d shape is called a icosahedron

Tetrahedron

A 3d shape can have infinite sides

a cube or a dodecahedron * * * * * Not a cube, which has only six sides!

A 3d shape with 10 sides is called a decahedron. I have added a link with some pictures of them. As you can see they look very different but all have 10 sides or faces.

well. it is called icosahedron

A triangular dipyramid.

sides are the face of a 3d shape and verticies are the corner of the shape

square

A quadrilateral is a plane or 2d figure with four sides. A 3d shape (object) has a name ending with -hedron, eg a tetrahedron which is a four sided 3d shape. A 3d quadrilateral has no meaning. Sides (edges) do exist in 3d shapes, but a more pertinent attribute is faces. Do you mean by "3d quadrilateral" a 3d shape which has a quadrilateral as a base and at most 4 or 5 other sides, ie a pentahedron (usually called a square pyramid) or a hexahedron (some types of which are called cuboids and cubes)? Please re-ask using consistent terminology, eg What is a 3d shape with one pair of parallel faces and 6 faces?

17

That is a Dodecahedron.