Perimeter = sum of the lengths of the sides.
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There is no standard formula. It is necessary to partition the irregular hexagon into more convenient shapes such as triangles and quadrilaterals, find their areas and sum the results.
If the hexagon isn't regular, then the formula is: Perimeter = (side-1 length)+(side-2 length)+(side-3 length)+(side-4 length)+(side 5 length)+(side-6 length) If the hexagon is regular, then the formula is: Perimeter = 6 x (length of any side)
100/3 inches, or 33.33 inches. The formula is perimeter/6
The answer depends on what you mean by size: its area (more likely) or perimeter. In either case, the answer depends on what information you have about the hexagon: whether it is regular, irregular but convex, or concave.
The perimeter of a hexagon with an apothem of 12 is 83.14