In geometry, the area enclosed by a circle with radius (r) is defined by the following formula: πr2
The Greek letter π ("pi") represents the ratio of the circumference of a circle to its diameter. In Excel, π is represented in a formula with the PI function, which returns the number 3.14159265358979, accurate to 15 digits:
=PI() // returns 3.14159265358979
To square a number in Excel, you can use the exponentiation operator (^):
Or, you can use the POWER function:
Rewriting the formula =πr2 as an Excel formula to for the example, we get:
The result is the same for both formulas. Following Excel's order of operations, exponentiation will occur before multiplication.