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Rotating mathematics answering questions
The rotation center of triangle ACE and triangle BCD is point C, and the rotation angle is 60 degrees.

∫△ABC and△△△ CDE are equilateral triangles;

∴∠acb=∠dce=600;

∴∠ace=∠bcd = 180-60 = 1200;

∫△ABC and△△△ CDE are equilateral triangles;

∴bc=ac; DC = EC;

∴△BCD is the same as△△△ ACE.

* * * The same point is C, ∠ ACB = 600; So the center of rotation is point C, and the rotation angle is 60 degrees.