How the ratio works
A royal cubit contains seven palms. The seked states how many horizontal palms correspond to a vertical rise of seven palms. It is therefore the reciprocal style of the modern rise-over-run slope: seked equals seven times half-base divided by height.
The documentary anchor
Problems 56 to 60 of the Rhind Mathematical Papyrus calculate pyramid slopes. The document is much later than the Great Pyramid, so it supports the Egyptian use of the method without serving as Khufu-era project paperwork.
Why 5½ matters
A seked of 5½ yields a rise-to-run ratio of 14:11 and a face angle near 51.84 degrees. That triangle also creates close pi and phi comparisons. Treating seked as the primary construction vocabulary explains why multiple modern constants appear together.
Continue the investigation
Test a conversion · See the Giza comparison · Read the full editorial standard