I have mentioned the fact that the height of the pyramid 481.25 imperial feet 280 royal cubits is 1/86400th diameter of the Earth other measures also 484 imperial feet x 86400 = 41,817,600 feet 7920 miles 12,672 ancient kilometres (metre 13.2 inches 1.00584 modern metre).
Some history behind the theory 43,000 times the height of the pyramid with the radius of the Earth.
"The Greek geographer Agatharchides of Cnidus (second century BC) wrote that the measurements of the pyramid of Cheops included units of geographic measure," and "Agatharchides of Knidos was right. The dimensions of the pyramid of Cheops reproduce the polar diameter and circumference of the Earth at a scale of 1/43.200."
". The dimensions of the pyramid of Cheops reproduce the polar diameter and circumference of the Earth at a scale of 1/43.200." Source (fr)
"In the second century BC [...] the Greek geographer and historian Agatharchides of Cnidus concluded that it "incorporated fractions of geographical degrees." In other words, the very configuration of the Great Pyramid is a reflecting microcosm of the Earth itself." Source: Opening the Ark of the Covenant: The Secret Power of the Ancients, the Knights Templar Connection, And the Search for the Holy Grail pg. 56, by Franz Joseph and Laura Baudoin, 2007."
These quotes were taken from this very interesting article [irna.lautre.net]