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The triangle with vertices $A (6, 1)$, $B (4, 1)$ and $C (4, 4)$ is rotated 90 degrees counterclockwise about $B$. What are the coordinates of the image of $C$ (the point where $C$ is located after the rotation)? Express your answer as an ordered pair.

 Jul 3, 2018
 #1
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C'(1|1)

laugh

 Jul 4, 2018

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