A square based pyramid has 4 triangular faces which means it has a total of 5 faces
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Apex.
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 :)
It is called the base.
square base pyramid
You did not give the height of the pyramid and 16 cm is not an area, but the area of the face would be one half the face height of the side of the pyramid times the length of the base side.