The names gives it away, it is pyramid shaped (or pyramidal in shape).
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It depends. A pyramid is a basic shape if you are reffering to the pyramids like the ones in Giza, Egypt those would be a square-based pyramid.
a pyramid
A Pyramid is a shape called a pyramid, there are no spheres in a triangulare shape.
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.
Yes, the Great Pyramid of Giza is a square pyramid. From a birds eye view, you could see that the bottom is in the shape of a square. See: http://www.mathsisfun.com/geometry/pyramids.html