Most often four, but it can vary.
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4 sides
A Mayan pyramid has five sides, including the rectangular base.
How many sides does a square based pyramid have... it has five including the base !
Pyramids are classified by the shape of their base. A triangular pyramid has a triangular base and three triangular side faces. A square pyramid has a square base and four triangular sides. A pentagonal pyramid has a pentagonal base and five triangular sides. A hexagonalpyramid has a hexagonal base and six triangular sides, and so on.
If you count the base, it has 4.