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While composing **the** ‘Geometry of **the** Great Pyramid’ for **the** Graham Hancock Forum (1), I found myself (unexpectedly) growing more and more incredulous that ancient Egyptians could have done maths like that. How could **they** have appreciated **the** amazing properties of **the** Great Pyramid’s unique pi/phi slope angle without that?

[NB, you might wish to read **the** earlier math section to refresh your memory] Instead, **they** had gradients for measuring slope, i.e. I found that slopes of **the** descending passages were related to those of **the** first and second **pyramids** as precise angle bisections, within an arcminute – which could surely not have been done using ancient Egyptian mathematics.

(5) **The** distance from **the** top of **the** pyramid to **the** base of **the** King’s Chamber, in relation to pyramid height, exactly expresses **the** root-two value.

Egyptian units of measure contain this concept, insofar as *they* convert from area to linear measure, (from remens to Royal cubits) but as far as anyone knows *they* did not have a precise value as here used.

(4) But Egyptian maths did not ‘square *the* circle’ in this manner, by equating *the* circumference of a circle with *the* perimeter of a square – only *the* Greeks did that, aeons later.

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