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What does rotating 90 degrees counterclockwise mean?

What does rotating 90 degrees counterclockwise mean?-example-1
User Akawhy
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Answer:

Explanation:

Rotations About The Origin

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 AmitA
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