John Taylor, an Englishman, is an amateur of astronomy and mathematics, and also a lover of pyramids. He made many amazing discoveries about the pyramids. He studied the pyramids according to the data provided in the literature. After calculation, he found that the Great Pyramid of Khufu contains many mathematical principles. First of all, he noticed that the base angle of the Great Pyramid of Khufu was 5 1 degree, not 60 degrees. It is found that the area of each wall triangle is equal to the square of its height. In addition, the ratio of tower height to tower foundation perimeter is the ratio of radius of the earth to perimeter, so pi can be obtained by dividing the tower height by twice the bottom edge.