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What are the coordinates of the point X'if the image is rotated 90° counter clockwise​

What are the coordinates of the point X'if the image is rotated 90° counter clockwise-example-1
User Hate Names
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Explanation:

When rotating a point 90 degrees counterclockwise about the origin our point A(x,y) becomes A'(-y,x). In other words, switch x and y and make y negative

User Cartesian Theater
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