Why pi was invented in maths?

Answer 1

Pi is a ratio which occurs repeatedly in nature. For example, the ratio of the circumference of any circle to its diameter is pi. The ancient mathematicians from India observed this relationship in circles as well as in other places. However, it gained popularity only when the knowledge of Indian mathematicians traveled to Arabia through the Persia, who were later conquered by invading Greeks, such as Alexander the great.

Answer 2

Pi, in mathematics, the ratio of the circumference of a circle to its diameter. The symbol π was devised by British mathematician William Jones in 1706 to represent the ratio and was later popularized by Swiss mathematician Leonhard Euler .

Answer 3

pi is a universal constant and so exists irrespective of human beings. It was not invented by any person.