depends on the centre of rotation
if it's about the origin the x coord is multiplied by -1
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It is the one point that does not move during rotation.
The angle at which a alphabet looks exactly the same during the rotation is called angle of rotation. Example- The alphabet I it rotates and the alphabet looks exactly the same after it rotates 2 times , so, the angle of rotation of the alphabet I is 2 , H-2 , K-4, M-4, etc.
I believe it was a fly on the ceiling of a bedroom in which Descartes was resting during an illness.
Charles Townshend
A 160 in the summer time and a 180 during the winter.