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Colloquially, it means to give it a one quarter turn. Imagine taking a dial that currently points upwards, and rotating it to point rightward. That is a 90° rotation. Similarly, the amount by which the minute hand in an analog clock moves in fifteen minutes should be 90°.

If you are looking to do this mathematically, the easiest way is to use a rotation matrix. In this case, you are rotating around the point 0, 0.

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Q: What does it mean to rotate an object to 90 degrees?
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