ATAN2

Syntax: ATAN2(X, Y)

X = a numeric value
Y = a numeric value

ATAN2 returns the 4-quadrant arc tangent of $Y/X$. At least one of the arguments must be non-zero. The result is the angle (in radians) and ranges between $-\pi$ and $\pi$. To convert the result from radians to degrees, use the DEGREES function.

Examples:

ATAN2(1, 1) = 0.78539816

ATAN2(A1, A2) = -0.78539816, where A1 = 10 and A2 = -10

ATAN2(D3, S5) = 1.5707963, where D3 = 0 and S5 = 1

ATAN2(0, 0) = Error - ATAN2, one argument must be non-zero

DEGREES(ATAN2(1, 3)) = 71.565

Excel function: ATAN2