Well, you see, when Hitler came to power in Germany, population pyramids went down, when Hitler killed all the Jews they all fell down, so there are no longer population pyramids, they are but a mere figment of everybody's imagination. If you believe this is real, and your teacher possibly asked you this, you both may be Paranoid Schizophrenics. But if you absolutely need an answer, the answer is Genocide, and the swastika.
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No it is not a polygon, simply because it is a 3D shape. Yes it has all the other features but it is a 2D shape which is not one of a polygon's features.
a pyramid is a 3D shape :)
A Pyramid is a shape called a pyramid, there are no spheres in a triangulare shape.
No. A pyramid is a three-dimensional shape.
a pyramid