it is the number of edges on one base plus 2. :) hope this helps!
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Any number from 5 upwards.
A prism has two polygonal faces at each end and these may have any number of sides, n. The prism also has n rectangular faces.
for any prism , number of ___ + number of vertices = number of edges + ___
The differnence is that a triangular prism has 5 faces and and rectangular prism had 4 faces.
For planar faces, any number you want of 4 of more.examples:a tetrahedron has 4 facesa triangular prism has 5 facesa cube has 6 facesa hexagonal prism has 8 facesa dodecagonal prism has 12 facesan icosahedron has 20 facesUsing a prism, the number of faces is the number of sides of the polygon of the ends plus 2. As any polygon can be used for the ends, the number of faces possible is any number 5 or more.