The value represents a half-rotation in the radian angle system.
The constant appears in many formulas relating the circle, such as the area of a circle….
Circumference of a circle
To calculate the circumference of a circle, you can use the PI function. In the example shown, the formula in C5 is: 2*PI()*B5 As the formula is copied down, it calculates the circumference of a circle for each radius given in column B.
