Problem 36 of 7
Decide whether figures are congruent by rotation 90 degrees clockwise about point (-1,-1).
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verify turn about a center preserves lengths and angles.
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Rotation center and angle must be specified.
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Solution
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1. Apply the stated rotation rule to each preimage vertex.
2. Compare results with the image vertices.
3. If all match, the rotation proves congruence.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Using translation evidence when rotation is specified.