There is nothing in the question that allows you to assume that the hexagon is regular and so there is are no simple formulae. You will need to divide up the hexagon into simpler shapes. For example, pick any point inside the hexagon and join it to all the vertices. You will get six triangles. Calculate the area of each triangle and then and these areas together. Similarly, measure each side of the hexagon and add them together to get the perimeter.
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In general you cannot find the perimeter of any shape if only the area is given.
How to do find hexagon
Measure and add the lengths together.
The perimeter of a hexagon with sides measuring 6 cm each would be 36 cm. To find the perimeter, you would simply add up the length of all six sides.
The lengths of the base and the side. You would multiply these to get the area and would double sum of the two to obtain the perimeter measurement.