The coordinates of triangle ABC are
A(2,2) B(3, -2) and C(-1, 3)
When rotating a point 270 degrees counterclockwise about the origin our point A(x,y) becomes A'(y,-x).
The coordinates A(2, 2) become A'(2, -2)
The coordinates B(3, -2) become B'(-2, -3)
The coordinates C(-1, 3) become C'(3, 1)
The triangle A'B'C' is the rotation of the triangle ABC after a 270 degree counterclockwise rotation.
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