About what point? Clockwise or counterclockwise?
Plot the first points on a graph and you will see many possibilities. The fact that this is a right triangle aligned with axis makes it simple. One possibility would be (7,0), (9,0) and (7,5) (For clockwise rotation about point B).
Please illustrate how to rotate triangle A(2,0), B(7,0),C(7,2) 90 degrees.
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