12 faces on a truncated icosahedron are pentagons. (The other 20 faces are hexagons.)
2 faces
If you are thinking of a solid with pentagonal faces, a dodecahedron, there are twelve pentagons
They can have faces which are triangles, quadrilaterals, pentagons, hexagons or heptagons. It has 8 faces and can have 6 to 12 vertices.
dodecahedron
pentagons
It is a Dodecahedron!
penatgon
Regular pentagons.
The shape of the 12 faces of a regular dodecahedron are regular pentagons.
Twelve regular pentagons comprise the faces of a dodecahedron.
A polyhedron with 12 congruent faces is a dodecahedron.