The four sides of the Great Pyramid were originally just over 755 feet each at the base (now slightly shorter because of lost casing stones), with the greatest difference between them only 7.9 inches. This error probably resulted from the cords used in measuring the base, which were of palm fibre or flax fibre and naturally stretched when used. Because of the mound in the middle, the Egyptians were unable to measure the diagonals to double-check their work; still, they were remarkably accurate.

1. ¿Cómo eran los cuatro lados de las pirámides?

2. ¿Cómo se medían los lados?

3. ¿De qué material eran los instrumentos para medir?