Straight line spin

Can you draw the graph of $y=x$ after it has been rotated $90$ degrees clockwise about $(1,1)$?
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Problem



Draw a diagram which shows the graph of $y=x$ after it has been rotated $90^{\circ}$ clockwise about the point $(1,1)$.

If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.