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You are quite right. They did not know pi. But they did know how to calculate the area of a circle by squaring 8/9 of its diameter squared.

Now apply this to the Great Pyramid. There is a popular belief that they used pi to make the slope. More correctly stated, this conception holds that the ratio of the height of the pyramid to its base perimeter is as the radius of a circle to its circumference. Notice that we have two different components of the circle implicated here - the radius and the circumference. This is vastly different from the two components given in RMP 50, namely the diameter and the area. And besides, the value of pi supposedly implied by the Great Pyramid shape is 22/7, quite different from the pi valued supposedly implied by RMP 50, which is (8/9)^2 x d^2.

Summing up:

The Egyptians did not know pi; the Egyptians did know how to square the circle; the shape of the Great Pyramid did not involve pi.

Now apply this to the Great Pyramid. There is a popular belief that they used pi to make the slope. More correctly stated, this conception holds that the ratio of the height of the pyramid to its base perimeter is as the radius of a circle to its circumference. Notice that we have two different components of the circle implicated here - the radius and the circumference. This is vastly different from the two components given in RMP 50, namely the diameter and the area. And besides, the value of pi supposedly implied by the Great Pyramid shape is 22/7, quite different from the pi valued supposedly implied by RMP 50, which is (8/9)^2 x d^2.

Summing up:

The Egyptians did not know pi; the Egyptians did know how to square the circle; the shape of the Great Pyramid did not involve pi.

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