If you're talking about a pyramid - it has either four or five sides (including the base) depending on how it's constructed.
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it is a 3 dimentional triangle ... it can be a pyramid with 5 sides ... or one with four sides
cube
Tetrahedron or triangular pyramid.
2D - the triangle 3D - the tetrahedron (i.e. it has a triangle on each side and there are 4 sides.
A triangle - any triangle - has 3 sides.