Documentation/How Tos/Calc: ATAN2 function

ATAN2

Returns the inverse tangent (the arctangent) for specified x and y coordinates.

Syntax:

ATAN2(x_coord; y_coord)

x_coord is the value of the x coordinate.

y_coord is the value of the y coordinate.

ATAN2 returns the inverse trigonometric tangent, that is, the angle (in radians) between the x-axis and a line from point x_coord, y_coord to the origin. The angle returned is between -PI and PI.

To return the angle in degrees, use the DEGREES function.

Example:

ATAN2(20; 20)

returns 0.785398163397448 (PI/4 radians).

DEGREES(ATAN2(12.3; 12.3))

returns 45. The tangent of 45 degrees is 1.

See also:

COS, SIN, TAN, COT

ACOS, ASIN, ATAN, ACOT

DEGREES

Mathematical functions