lateral faces
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A triangular prism can have a square or triangular base, but faces are normally triangles. (I think)
A prism has 2 congruent parallel faces called bases. The other faces, most often rectangles, are called lateral faces. The prism is named by the shape of its base.
most likely a triangular prism
The surface area of a right prism is the sum of the areas of all its faces. The formula for calculating the surface area of a right prism is 2 × (base area) + (lateral area), where the base area is the area of the base shape and the lateral area is the sum of the areas of the remaining faces. The lateral area can also be calculated by multiplying the perimeter of the base shape by the height of the prism.
An octagon based prism.