The base, or bottom of pyramids was often square, which was a common feature of most constructed in antiquity. This may relate to the natural construction of early houses, which were typically round or square. The four sides were generally triangular because they tapered upward to a smaller size or apex. So a typical pyramid is a solid pentahedron with a square base and four triangular sides.
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square based pyramid
A square pyramid's base is a square. You can tell by the name (for exp. a triangular pyramid's base is a triangle.) Good luck with whatever you need it for :)
The answer is no. A square pyramid can not have all triangle faces because the base of this particular pyramid would be a square.
No. I has 3 triangle faces and one square face.
One side of a square would be untouched with only 3 triangle faces attached to it. To make an entire closed shape, it would need another part or some 3 dimensional bending would need to take place. A pyramid has 1 square face and 4 triangle faces. A pyramid could also have 4 triangle faces where one triangle substitutes the square face.