Flash math , using atan2 …

Usage

Math.atan2( y, x )

Parameters
x A number specifying the x coordinate of the point.

y A number specifying the y coordinate of the point.

Returns
A number.

Description
Method; computes and returns the arc tangent of y/x in radians. The return value represents the angle opposite the opposite angle of a right triangle, where x is the adjacent side length and y is the opposite side length.

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