In the Rigveda, a formula to find the area of a circle is mentioned showing that the Rishis knew of pi, approximating it to be equal to 22/7. It was used in the formula for the area of a circle
area of a circle = pi*(AB/2)^2 where AB is the diameter of a circle.
area of a circle = pi*(AB/2)^2 where AB is the diameter of a circle.