3
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Three.
You should see 3 sides since the base is triangular (3 sides)
One, if you are looking at the base face of the pyramid.
Unlike a tetrahedron (a four-faced shape with all triangular faces), a pyramid has a square (or rhomboid) base and triangular sides. Thus, a view from any side will yield a triangular appearance, while a view from below or above shows a square or rectangular shape.
the top viw of a triangular prism is a triangle