It means that pi (pi times diameter) is about 3. 14.

It is used to calculate the circumference (area) of a circle and the surface area (volume) of cylinders and cones.

π characteristics of extended data

It is of little practical significance to calculate the value of pi so accurately. A dozen pi values used in modern science and technology are enough. If the value of pi with 39-bit precision is used to calculate the size of the universe, the error is less than the volume of an atom.

In the past, people calculated pi to explore whether pi circulated decimals. Since Lambert proved that pi is irrational in 176 1 and Lin Deman proved that pi is transcendental in 1882, the mystery of pi has been uncovered.

algebra

π is an irrational number, that is, it cannot be expressed as the ratio of two integers, which was proved by Swiss scientist johann heinrich lambert in 176 1. In 1882, Lin Deman proved that π is a transcendental number, that is, π cannot be the root of any integer coefficient polynomial.

References:

Baidu encyclopedia -pi