The perimeter of the pyramid on the ground. Take the Great Pyramid of Egypt as an example. The ratio of its height (48 1.3949 feet) to its circumference (3023. 16 feet) is exactly equal to the ratio of the radius and circumference of a circle, that is, 2π. (2π≈6)

When pyramid of khufu was newly built, it was 146.59 meters high and 230 meters long at the bottom. It is made up of more than 2.5 million boulders, each weighing about 2.5 ~ 5.0 tons.

The extended information pyramid of Khufu has been built for 20 years. By building long ramps, workers can continue to transport stones to high places. Workers used the natural sand of Giza, bonded with gypsum and plaster, piled up a long slope and pulled the boulder towards the pyramid. Archaeologists estimate that the length-height ratio of the slope is about 10: 1, which is the best ratio to ensure convenient transportation and use the least building slope materials.

However, as the pyramid gradually becomes higher, this long slope cannot be applied, because according to this calculation, the length of the slope leading to the top of the tower will reach an astonishing 4,800 feet, and the required building materials will be three times that of the Great Pyramid. Therefore, in the final heightening project, architects will choose to build spiral ramps that save materials.

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