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Question 176679: How do you rotate an image 90 degrees about the origin?
Answer by Mathtut(3670)   (Show Source):
You can put this solution on YOUR website! A rotation by 90° about the origin. The general rule for a rotation by 90° about the origin is (A,B) (-B, A) where A is composed of coordinates making up the object.
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lets say you have a point P(2,-3). The 90 degree rotation would place it at P'(3,2) under our general rule. You will see that once you plot these two points if you draw a line from the origin to point P and another line to P' the two lines will be perpendiular thus forming a 90 degree angle. that is a good way to visually check to see if you have actually rotated 90 degrees.
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Do this for every point in the object and you will end up with a 90 degree rotation
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hope that helps
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