It depends on the size of the hexagon. If the hexagon is very very small, the length of a side could be a nanometre (or smaller). If the hexagon is large, the length could be a light year (or more). In fact, a single hexagon could have one side that is a nanometre in length and another side that is a light year.
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The perimeter of a hexagon is the sum of its 6 sides.
Not if the hexagon is a regular hexagon with sides of the same length as the sides of the square.
In general, none. If all the sides of a hexagon were of different length it would have no symmetry.
All hexagons have 6 sides.
Hexagons have six sides, not four. Any number of them can be of the same length.