We can first find the area of a hexagon. If we break it into 6 equilateral triangles, we can calculate their areas. Let's say the side length of the regular hexagon is s. The area of one of the equilateral triangle is , so the area of the entife hexagon is Because we know the area is 3, we can solve for s:
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This is best I can go. It get's really complicated if you go even further. Please let me know if I made a mistake.