If you include the base as a side (you should) then the answer is no. If you don't then you can have a tetrahedron. The name implies a solid shape with four (tetra-) sides so the base really should be counted.
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When did EGYPTIAN build smooth sided pyramids
Smooth [sided] pyramid Step [sided] pyramid Bent pyramid
they changed it because they were to lazy to walk up steps so they changed it to flat sided because they wanted to get their motorized wheel chairs up the side
there were no windows in the pyramids because if there was windows in the pyramids then the structures wouldn't be a straight four sided figure that is like the North Star, because it has four sides and each side counts as a direction
Las pirámides no son iguales. Hay que tener en cuenta que antiguamente una de las mayores incógnitas era el cielo. Muchas civilizaciones se preguntaban qué sería, qué habría etc. y la cuestión es que no todos construían las pirámides de la misma manera.