Question

If triangle abc was rotated 90 degrees clockwise around point c then what would be the coordinates of vertex A

Answer 1

Diagram? Co-ordinates of A B and C?

Answer 2

If you rotate it 90 degrees clockwise, then the coordinates would map as follows
(x,y) -> (-y, x), and if it is counterclockwise, is is (x,y) -> (y,-x). Hope this helps :D