if a square has edges abcd is it necessary to name it in alphabetical order
No. The Louvre is a normal, rectangular building. The Pyramide du Louvre, which is outside the main Louvre building is a square based pyramid.
It is just called a square pyramid, but its not square. Its only square on the bottom, so they call it a square pyramid, or you can simply just call it a pyramid because a pyramid is a pyramid.
4 triangles and 1 square
It is simply called a square based pyramid
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