1, Pi is a transcendental number, which is not only irrational, but also more irrational than irrational. One of the characteristics of irrational numbers is that the fractional part is infinite and acyclic. For example, the cyclic decimal 0.9 is infinite, but it is repeated. And pi is infinite, and the numbers don't repeat, so pi looks like a long string of numbers.
2. Archimedes was the first to draw the conclusion that pi is about 3. 14. Legend has it that he was forced to a beach by Roman soldiers when he died. He calculated pi on the beach and said to the soldiers, "Don't kill me yet, I can't leave an imperfect geometry problem for future generations." Archimedes' method of calculating pi is bilateral approximation: the perimeter of a circle is approximated by the perimeter of inscribed regular polygon and circumscribed regular polygon. The more sides of a regular polygon, the closer the perimeter of the polygon is to the side length of a circle.
3. In the past, people calculated pi in order to explore whether pi circulated decimals. Since Lambert proved that pi is irrational in 176 1 year and Lin Deman proved that pi is transcendental in 1882, the mystery of pi has been uncovered. Nowadays, people calculate pi mostly to verify the computing power of computers and also for interest.