To rotate an object you need a center of rotation and how much you want to rotate it. By convention, positive rotations go counter clockwise, and negative rotations go clockwise.
of How to Perform a Rotation in Math
The demonstration below that shows you how to easily perform the common Rotations (ie rotation by 90 , 180 , or rotation by 270) . There is a neat 'trick' to doing these kinds of transformations. The basics steps are to graph the original point (the pre-image), then physically 'rotate' your graph paper, the new location of your point represents the coordinates of the image. It's much easier to understand these steps if you watch the visual demonstration below.
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