During Pharaoh Khufu's reign Abraham had visited the Egyptians. When Abraham was staying at Egypt, Abraham taught the Egyptians Math and Astronomy. Later on, the Egyptians made use of their knowledge for Math and Astronomy in building pyramids. They had built the Great Pyramid, and they used their knowledge on it by making the faces of the pyramid face true North, East, South, and West. And the square-base circumference of the Great Pyramid was about the same as the equatorial circumference of the earth. and this showed that the Egyptians were very good at Math and Astronomy.
The Great Pyramid is one of the most famous buildings in the world! The Egyptians built the Great Pyramid with about 2.3 million blocks of limestone, and the blocks that were used to make the Great Pyramid weighed about 2.5 tons. Building the Great Pyramid in about twenty years. So that means that one stone had to be transported to the pyramid in 2 minutes. The Pyramid was approximately 147 meters tall. The servants that Khufu made do the work were good workers, but it is still a wonder that Pharaoh Khufu finished the Great Pyramid so quickly. The work was so wonderfully done that even a knife's blade can't fit between the blocks, even now! Pharaoh Khufu accomplished many things during his reign.