There are records of why it was bent though. It was one of the first pyramids. The king wanted it very tall and steep. he ended up being burried in a pyramid with less slope. Do you have any archeological evidence of complex geometry being used?

Again, the pyramids are an impressive feat of craftsmanship and the organization of labor, but does that mean they employed the pythagorean theorem?

They may very well have known geometry, or at least developed during the course of their civilization but I don't think the pyramids represent sufficient evidence for them definitely knowing the pythagorean theorem

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