The first classic "smooth sided" pyramid shape was attempted by the Pharaoh Sneferu, who founded the 4th Dynasty of the Old Kingdom. Sneferu reigned from either 24-48 years, around 2600BCE, and during this time he was responsible for three separate pyramids. His first pyramid, the Medium Pyramid seems to be the first attempt at the classic pyramid. The Medium Pyramid is famous because it appears to have collapsed and was never finished. Sneferu's second attempt was the Bent Pyramid, which gets it name from the sharp angle its sides take about halfway up the sides. The third pyramid that Sneferu attempted is the Red Pyramid and is the first classical pyramid and was the tallest manmade structure in the world until Khufu's Great Pyramid at Giza was constructed.
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It is the net of its solid shape. If the top of the pyramid is cut off parallel to the base, then it is a truncated pyramid, or a frustum.
it changed the shape and size
A ziggurat is a structure which takes the form of a terraced pyramid, with a flat platform at its apex.
A pyramid is typically thought of as a triangular shape. The pyramids in Egypt are considered incredibly awesome national monuments.
They both built them as homage to their kings or gods. The reason stone structures were used it presumably because stone was the most durable material available. There are many guesses, but no one knows why the pyramid shape was chosen.