the Mayan had four outer sides and a base for a total of five. Only four are visible.
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exactly 6 sides
5 sides
20 faces and 10 sides
A pyramid must have at least four faces (sides) so a three sided pyramid is mathematically impossible.
4 faces. The number of faces on a pyramid is one more than the number of sides of the base. A triangle has 3 sides, therefore a triangular pyramid has 3 +1 = 4 faces.