Half the length from one vertice to its opposite.
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This cannot be answered without any given side lengths, since the interior angles of an irregular hexagon are different. Only the angles of a regular hexagon can be found without side lengths, and that is 120 degrees per angle.
Side length x 6 = perimeter
Perimeter of regular 6 sided hexagon: 6*7 = 42 inches
The area of a regular hexagon with side lengths of 8cm is about 166.3cm2
The perimeter of a regular hexagon with a side length of 6.8mm is 40.8mm