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Describing Rotations

Let's first copy the figures.

Looking at the figures, we can see that they share a vertex.

Next, we will draw two line segments. One of them from the point of rotation to a vertex of the preimage. The other one from the point of rotation to the corresponding vertex of the image.

Finally, we will measure the angle between the lines we drew by using a protractor.

As we can see above, the angle of rotation is about