Place the formula =PI() into the cell you want to see the result.. Press the Enter key to see the result. Excel will return the PI 3.141593.

Type "PI()", which is equivalent to "3.14159265358979" in an Excel formula. Type the remainder of your formula. For example, to calculate the circumference of a circular area with a radius of 15 ...

Formulas are powerful tools for performing calculations and analyzing data in Excel. In this beginner’s guide, you’ll learn how to use formulas and explore some popular built-in functions.

Use a mathematical reference to look up the formula for the secant function, which is the inverse of the cosine of an angle (see link in Resources). Click in cell D2 to enter the secant function ...