a hexagonal pyramid
Edges or sides? There are 3D figures with one side and one edge.
A cube or a cuboid (also known as a rectangular prism).
The answer is a sphere.
a cuboid has 12 edges
a hexagonal pyramid
The REGULAR dodecahedron, formed from 15 pentagonal faces, has 30 edges. But there are a number of other 3-dimensional figures which have 12 faces (sides), with different numbers of edges and vertices.
It depends on the same edges as WHAT!
Edges or sides? There are 3D figures with one side and one edge.
12 edges in a cube.
A cube or a cuboid (also known as a rectangular prism).
The answer is a sphere.
a cuboid has 12 edges
There are infinitely many spatial figures and it is not possible to give a comprehensive answer. For a partial answer, see the following link. However, the link is concerned only with polyhedra. There are other spatial figures - like spheres and ellipsoid etc.
sides of the solid figure
12 edges.
An octahedron has 12 edges.