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Returns the angle between the vector represented by x,y and the direction of the x -axis. The result is a number in the current unit of measure for angles.
Syntax
ATAN2(y, x )
Parameters
| Name | Required/Optional | Data Type | Description |
|---|---|---|---|
| y |
Required |
Numeric |
The y-value of the point. |
| x |
Required |
Numeric |
The x-value of the point. |
Remarks
The arctangent is the angle measured counterclockwise from the positive x -axis to a line that intersects the origin (0,0) and the point represented by x and y. In Microsoft Visio, ATAN2(0,0) returns 0. To force the result of ATAN2 into a different angular measurement, use the DEG or RAD function.
The ATAN2 function is the antifunction of the TAN function. The ATAN2 function returns the angle whose angle is equal to y divided by x. If ATAN2(y,x) represents an angle in a right triangle, y is the "opposite side" and x is the "adjacent side," so the function could be written as ATAN2(opposite,adjacent).
Example 1
ATAN2(1.25,2.25)
Returns 29.0456 deg
Example 2
ATAN2(1,SQRT(3))
Returns 30 deg
Example 3
ATAN2(1,1)
Returns 45 deg