ATAN2

Returns the inverse tangent (the a rctangent) for specified x- and y-coordinates as an angle in radians between -pi and pi, excluding -pi. This equals the angle between the x-axis and a line from the origin (0,0) to the given point (x_coord, y_coord).

Syntax

ATAN2(x_coord; y_coord)

x_coord: The value of the x coordinate of the point. Eg., -2

y_coord: The value of the y coordinate of the point. Eg., 3

Examples

Formula	Result
=ATAN2(1;1)	0.785398163
=ATAN2(-2;3)	2.15879893
=ATAN2(3;-1)	-0.321750554

Get a hands-on experience of the function in the embedded range below.

Remarks

To return the angle in degrees, use the DEGREES function or multiply it by 180/PI().

Possible Errors

Errors	Meaning
#N/A!	The function could not find the value it was asked to look for. Commonly occurs in VLOOKUP and similar functions.
#NAME!	The function name is incorrect or invalid. The given defined name (if any) is invalid. There is a typo in the defined name used in the function. Double quotes are missing for text values in the function. Colon missing in a cell range reference.
#VALUE!	The given argument's data type is incorrect or invalid. For example, the function =DATE(A1:A3) will return a #VALUE error when a text value is present in the range.
#REF!	The given cell reference is incorrect or invalid. This error may occur when a cell/range has been deleted, moved, or pasted over.

Similar Functions

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