 The Step Pyramid Complex of Djoser (Zozer) was built during the Third Dynasty (2800 BC) in what is now Saqqara, Egypt by the architect Imhotep. That would have been way before Abraham's time. Djoser's Step Pyramid is generally considered the first tomb in Egypt to be built entirely of stone. There were several stages of the structure suggesting that the architecture was changed based on experimenting.
It is easy to see how this links the Mesopotamian ziggurats to the more famous Egyptian pyramids.
The Bent Pyramid was probably either the first or second of Snefru's pyramids. It actually went through about three different alterations away from the original plans, which called for the structure to have an angle of almost 60°. The slope was changed to a less steep slope of almost 55°, requiring that the base be enlarged. However, this adjustment in slope proved to be inadequate. When the pyramid was about 150 feet high, the angle of the slope was reduced to 45° (later pyramids usually had a slope of between 52 and 53 degrees), which had the effect of reducing the mass of the upper part of the pyramid and thus reducing the load on the substructure. At this point in the pyramid's construction, the builders began laying the stone courses horizontally (rather than with the stones sloping inwards). Apparently the builders had learned that the inward sloping layers of the core, rather than adding stability, actually increased the stresses within the structure.
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