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15 sneaky math puzzles hiding inside the Great Pyramid

The Great Pyramid of Giza is often treated as a monument of stone, but it also functions as a monument of numbers. I see at ...
insider.si.edu

Patterns for Geometric Models of A. Harry Wheeler

1. folded sheet with pattern drawn on it. This is labeled: Triangular Prism (/) Separated into Three (/) Triangular Pyramids (/) Prop 18. It also is labeled: Model 45. It also is labeled: April-9-1916 ...