The word triangle implies the 3 sides of a triagle so I would say the answer is 3.
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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.
4 sides
If you count the base, it has 4.
A square pyramid has a square base and four triangular sides.
A triangular based pyramid has 4 sides. 3 triangle sides and 1 Square base