The 3D shape formed by regular pentagons is a dodecahedron, which has 30 edges.
There are no straight edges in a sphere, it is basically a 3-D circle
a pentagon.... it is pretty self explanatory.
There is no such object. A decahedron is a 3-d object with 10 faces whereas a dodecahedron is a 3-d object with 12 faces. Each of them can have different numbers of edges.
12, if you mean a dodecahedron, a 3-d figure with only pentagonal faces.
15
The 3D shape formed by regular pentagons is a dodecahedron, which has 30 edges.
A 3-D pentagon
a 3-d dodecahedron has 12 pentagon shaped sides
12
there are 12 (twelve) edges.
Pentagon prism
The 3-d figure formed from regular pentagons is the dodecahedron which has 20 vertices.
There are no straight edges in a sphere, it is basically a 3-D circle
A pentagon is a 2-D shape. There is a 3-D shape with 12 faces, each a regular pentagon. It's called a dodecahedron. To make one out of (stiff) paper, you would cut out a "net", then fold and glue the edges. See related link for an illustration of a net you could print out.
a pentagon.... it is pretty self explanatory.
There is no such object. A decahedron is a 3-d object with 10 faces whereas a dodecahedron is a 3-d object with 12 faces. Each of them can have different numbers of edges.