September 28, 2021

# How to use the Excel ATAN function

The Excel ATAN function returns the inverse tangent or arc-tangent of a number. In geometric terms, the function returns the angle of a right-triangle given the ratio of its opposite side over its adjacent side. The ATAN function is the inverse of the TAN function

Syntax: =ATAN(number)

The ATAN function syntax has the following arguments:

• Number (Required): The tangent of the angle you want.

Example: Let’s look at some Excel ATAN function examples and explore how to use the ATAN function as a worksheet function in Microsoft Excel: Syntax:  =ATAN(G26)

Result: Based on the Excel spreadsheet above, the following ATAN examples would return:

Syntax: =ATAN(G27)
Result: 1.434657366

Syntax: =ATAN(G28)
Result: 1.428899272

Syntax: =ATAN(G29)
Result: -1.56079666

Syntax: =ATAN(G30)
Result: 0.5404195

Syntax: =ATAN(G31)
Result: -0.109559527

Syntax: =ATAN(G32)
Result: 0.785398163

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