rotating movieclip back to square. AS3

I have a movieclip that I am using greensocks transformManager with so the user can rotate, skew, and scale the clip. This works fine, but I am trying to add a crop tool. If the image is rotated, when I send the image to the crop tool it measures the height of the image by th开发者_高级运维e bounds of the rotated image, not the actual height of the image if it were square (re: not rotated).

So, what I tried to do what, after sending it to the crop tool, rotate it back to 0 before getting the bounds using this code:

var currRot:Number = sourceImg.rotation;


                if(currRot != 0)
                {


                    sourceImg.rotate(Math.abs(currRot));


                }

But what I get traced out is this:

bbefore rotation = -3.7218458499403075 after rotation = 143.0320952700549

I don't understand the math here. Shouldn't it just rotate 3rads in the positive direction to equal it out? How would I return it to 0;

You can use sourceImage.getBounds(sourceImage) to get the real size of the object, even after transforming it.