|Excel Developer Reference|
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 A variable that represents a WorksheetFunction object.
|Arg1||Required||Double||The x-coordinate of the point.|
|Arg2||Required||Double||The y-coordinate of the point.|
- 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.