This figure illustrates the output of the arctangent function. As with other trigonometric functions the radians angle system is used for the return value of the function.
Given the x and y components of a point, returns the angle associated with the point.
There are six trigonometric functions that relate to the geometry of the right-triangle sine, cosine, tangent, cosecant, secant, and cotangent. The functions take the angle of a right triangle as input and return a ratio of two of its sides.
Radians are a unit that measure angle using the radius of a circle. One radian is equal to the amount of rotation required to travel the length of one radius along the circumference of the circle.