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Mathematics regular polygon and circle in the third grade.
Hello, I just want to say a simple method:

Turn left | turn right

Connecting OA, OC and OE, it is easy to prove that the area of △AEF is equal to △OAE, the area of △ABC is equal to △OAC, and the area of △CDE is equal to △OCE, so the area of regular hexagon ABCDEF is twice that of regular triangle ACE, so it is 96√3.