Definition: During the reign of Snefru, pharaoh of Egypt and founder of the Fourth Dynasty (2680-2560 B.C.), the sides of a step pyramid were filled in with stone and covered with lime. This was a necessary step in the evolution of the straight-sided pyramid, but there was an intermediary step -- the bent pyramid. Halfway up the bent pyramid, the angle was a steep approximately 51 degrees, but then for the top half, the incline was more gradual (only about 43 degrees).
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