K.D. Shives is pursuing a PhD in Microbiology at the University of Colorado Anschutz Medical Center. She can be found blogging about current topics in microbiology at kdshives.com and on twitter ...
Rotate the rectangle ABCD 90° clockwise about the point (0,-1). Each corner of the image A'B'C'D' is the same distance from the centre of rotation as the original shape.
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