Question

How are the coordinates of the new point found if it is rotated 90° counterclockwise? How many degrees is that equivalent to if the rotation is clockwise?

Answer 1

\[
(x,y)\to (y,-x)
\]

Answer 2

When going clockwise, you basically subtract from \(360^\circ\).
So \(360^\circ -90^\circ = 270^\circ\).