1.π mathematically represents pi, and the quotient of pi divided by the diameter of this circle is usually abbreviated as 3. 14.

2. π can also be considered as the ratio of circumference to diameter, which is an irrational number (that is, infinite acyclic decimal).

3.π can be used to calculate the square ratio of circular area to radius, that is, to calculate the circumference of a circle.

Circular area

Key values of geometric shapes such as sphere volume.