The same as 180 degrees clockwise. What do you mean "the answer to"?
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Fomula(work with both clockwise/counterclockwise):(-x,-y)
Change the sign: from + to - or - to +
270 degrees is 3/4 of the way around the circle. Ir is the same as rotating it 90 degrees (1/4) of the way clockwise. Turn it so anything that was pointing straight up would be pointing to the right.
If a point is at coordinates (x , y), then move it to (-x, -y).