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the Greeks had a food that looked like a pyramid and was called something similar to it.
The food pyramid is a triangle because it is the easiets to represent the data
a pyramid
A four sided pyramid is called a square based pyramid. It has a square base and four sides,(called edges,) that join at the apex. (the top of the pyramid.)
They're not always. But anytime something is not a pyramid shape, it's not called a pyramid,it's called something else. So everything that's left ... all the things that are a pyramid shape ...is called a pyramid.