there are 12 (twelve) edges.
Is called a Dodecagon. * * * * * A dodecagon is a 2-dimensional (plane) shape with 12 SIDES. The term EDGES is normally used in the context of 3-dimensional objects. One such shape is a parallelopiped. A cube is a special case of a parallelopiped. In 3-D, a parallelopiped is to a cube what, in 2-D, a parallelogram is to a square.
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. An octohedron can have 12 to 18 edges.
A pentagonal pyramid has 10 edges.
There is no such 3-d shape if it also has flat faces.
A cube.
-12
A cuboid, on its base, is a 3-d shape and four of its edges are vertical.
-3
The 3D shape formed by regular pentagons is a dodecahedron, which has 30 edges.
It is a cube or a cuboid
A sphere.