ATAN2
Returns the arctangent 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 -p and p, excluding -p.
Syntax
ATAN2(x_num,y_num)
X_num is the x-coordinate of the point.
Y_num is the y-coordinate of the point.
Remarks
- 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 the #DIV/0! error value.
- To express the arctangent in degrees, multiply the result by 180/PI( ).
Examples
ATAN2(1, 1)
equals 0.785398 (p/4 radians)
ATAN2(-1, -1)
equals -2.35619 (-3p/4 radians)
ATAN2(-1, -1)*180/PI()
equals -135 (degrees)