You want to work with angle values in ActionScript, but you must convert to the proper units.

Create custom `degToRad( )`

and
`radToDeg( )`

methods.

The `_rotation`

property of a movie clip object is
measured in degrees. Every other angle measurement in ActionScript,
however, uses radians, not degrees. This can be a problem in two
ways. First of all, if you want to set the
`_rotation`

property based on the output of one of
ActionScript’s trigonometric methods, you must
convert the value from radians to degrees. Second, humans generally
prefer to work in degrees, which we must convert to radians before
feeding to any of the trigonometric methods. Fortunately, the
conversion between radians and degrees is simple. You should add the
following `degToRad( )`

and ```
radToDeg(
)
```

methods to your `Math.as`

file for
converting from degrees to radians and vice versa. Note that they are
attached directly to the top-level `Math`

object,
making them available throughout your movie.

// Convert degrees to radians by multiplying by π and dividing by 180. Math.degToRad = function(deg){ return (Math.PI * deg) / 180; }; // Convert radians to degrees by multiplying by 180 and dividing by π. Math.radToDeg = function(rad){ return (rad * 180) / Math.PI; };

This following code demonstrates how the methods work:

trace(Math.degToRad(90)); // Displays: 1.5707963267949 (which is π/2) trace(Math.radToDeg(Math.PI)); // Displays: 180

These two methods are invaluable when ...

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