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Beijing normal university printing plate eighth grade second volume mathematics textbook page 77 exercises the answer.
Answer: 1. Solution: (1) Point A is the center of rotation. Not good? CAE？ DAF is the rotation angle;

(2)AB=AD=AF，AC=AE，BC=DE，CD=EF，？ Bad =? CAE=？ DAF？ BAC=？ DAE？ CAD=EAF，？ BCA=？ DEA，？ ACD=？ AEF？ ABC=？ Ed. BCD=？ DEF，？ ADC=？ AFE。

2. No, because the distance from the corresponding point to the rotation center should be equal before and after rotation, and OA? OC，OB？ OD, so you can't rotate around the O point, so the AB line and the CD line coincide.

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