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Describing Rotations

Describing Rotations 1.8 - Solution

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To find the measure of the angle of rotation of about the origin, it is enough to compare one of the vertices of and its corresponding image.

Let's compare and Knowing that the center of rotation is the origin, we will first draw two segments from and to the origin. Then, we will determine the angle between the segments.

As we can see above, the segments form a straight angle. Therefore, the measure of the angle of rotation is