ATAN2

ATAN2(x_num, y_num)

Returns the arc-tangent of the given x and y co-ordinates.

x_num	The x-coordinate of the point.
y_num	The y-coordinate of the point.

REMARKS

* For an illustrated example refer to the Trigonometric Functions page.
* The arc-tangent of an angle is the inverse of the TAN function.
* ATAN2(x_num , y_num) equals ATAN(y_num / x_num), except that "x_num" can equal 0 in ATAN2.
* The arc-tangent is the angle from the x-axis to a line containing the origin (0, 0) and a point with coordinates ("x_num", "y_num").
* If "x_num" = 0 and "y_num" = 0, then #DIV/0! is returned.
* The returned angle is given in radians between -PI and PI (excluding -PI).
* A positive result represents an anti-clockwise angle (from the x-axis).
* A negative result represents a clockwise angle (from the x-axis).
* If your argument is in degrees, multiply it by PI/180 to convert it to radians.
* If you want to convert the result from radians to degrees, multiply it by 180/PI.
* You can use the DEGREES function to convert from radians to degrees.
* For the Microsoft documentation refer to support.microsoft.com
* For the Google documentation refer to support.google.com

	A
1	=ATAN2(1, 1) = 0.785
2	=ATAN2(-1, -1) = -2.356
3	=ATAN2(2, 3)=ATAN(3/2) = True
4	=ATAN2(-100, -100) = -2.356
5	=ATAN2(0, 1) = 1.571
6	=ATAN2(0, 5) = 1.571
7	=ATAN2(0, -0.5) = -1.571
8	=ATAN2(-0.5, 0) = 3.142
9	=ATAN2(-1, -1)*180/PI() = -135
10	=ATAN2(0, 0) = #DIV/0!
11	=ATAN2("some text", 1) = #VALUE!
12	=ATAN2(1, "some text") = #VALUE!