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# WorksheetFunction.Atan2 Method (Excel)

Office 2010

Returns the arctangent, or inverse tangent, of the specified x- and y-coordinates. The arctangent is the angle from the x-axis to a line containing the origin (0, 0) and a point with coordinates (x_num, y_num). The angle is given in radians between -pi and pi, excluding -pi.

expression .Atan2(Arg1, Arg2)

expression A variable that represents a WorksheetFunction object.

### Parameters

Name

Required/Optional

Data Type

Description

Arg1

Required

Double

The x-coordinate of the point.

Arg2

Required

Double

The y-coordinate of the point.

### Return Value

Double

• A positive result represents a counterclockwise angle from the x-axis; a negative result represents a clockwise angle.

• Atan2(a,b) equals Atan(b/a), except that a can equal 0 in Atan2.

• If both x_num and y_num are 0, Atan2 returns an error value.

• To express the arctangent in degrees, multiply the result by 180/PI( ) or use the Degrees method.