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Q: Is dedecahedron a solid pyramid

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A pyramid has the solid quadrilateral pyramid solid shape.However there are also pyramids with geometrical polyhedra/platonic solid shapes of tetrahedron.

Square Pyramid

a square pyramid

Yes.

The number of vertices on a solid pyramid will depend on its base as for example if it is a triangular based pyramid (tetrahedron) then it will have 4 vertices, 6 edges and 4 faces.

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the pyramid is a solid triangle. aka pyramid. A cube is well a solid square that is 3D. So is a pyramid.

A pyramid is a solid figure with one vertix.

A pyramid has the solid quadrilateral pyramid solid shape.However there are also pyramids with geometrical polyhedra/platonic solid shapes of tetrahedron.

Square Pyramid

The solid commonly called a dodecahedron is not a solid pyramid but the name simply means a solid shape with 12 faces and so, a pyramid on a 11-sided polygonal base will be a dodecahedron.

Yes.

All the faces of a regular polyhedron are the same regular polygon. There are only 5 such shapes: A tetrahedron (triangular pyramid) A hexahedron (cube) Octahedron (two square based pyramids stuck together on the square faces) Dedecahedron (12 pentagonal faces) Icosahedron (20 triangualr faces). A sphere, although not a polyhedron, is also a regular solid shape. Any other solid shape is not a regular shaped solid.

it not a shape, its a geometrical solid and it is called a pyramid.

pyramid

rectangular pyramid

Yes a pyramid is a 3 dimensional solid object

A triangular di-pyramid. A square based pyramid.

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