Geometry instrument
Pyramid geometry and seked calculator
Calculate slope, slant, volume, surface area, the Egyptian seked, and transparent pi and phi comparisons.
Calculated geometry
Face angle
Seked
Slant height
Volume
Surface area
Perimeter / height
Slant / half-base
Historical anchorThe Rhind Mathematical Papyrus demonstrates Egyptian seked calculation, but it post-dates the Great Pyramid. The method is documented Egyptian mathematics; direct use on Khufu's project remains inferred.
Formula set
For base side b and height h, half-base is b/2, slant height is sqrt(h² + (b/2)²), and seked is 7(b/2)/h palms.
Compare all three Giza models · Read the seked guide · Audit the formulas