Pi is the ratio of the circumference to the diameter of a circle, which is generally expressed by the Greek letter π and is a universal mathematical constant in mathematics and physics.
π is also equal to the ratio of the area of a circle to the square of its radius. Accurate calculation of geometric shapes such as circle perimeter, circle area and sphere volume is the key value. In the analysis, π can be strictly defined as satisfaction crime? x？ The smallest positive real number x = 0.
Extended data:
2πr means that the circumference of a circle is equal to twice the radius (diameter) times π.
C=2πr is a common formula for calculating the circumference of a circle, where r refers to the radius of the circle and π is π.
π value is the result that the ancients found that the length and diameter of a circle kept a certain relationship. The most commonly used method is the secant circle method, that is, infinite secant circle, but the secant circle of a circle is infinite, so there is no specific and complete π value at present.