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If shaped like an Egyptian pyramid it has 5 sides as the base also counts. If the base itself is triangular it has just 4 sides
A square-based pyramid.
A pyramid.
If you're talking about a pyramid - it has either four or five sides (including the base) depending on how it's constructed.
it is a 3 dimentional triangle ... it can be a pyramid with 5 sides ... or one with four sides