24cm ! A hexagon has six sides... 6 x 4 = 24 !
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The perimeter of a regular hexagon is (6 x the length of one side).
9 units
8
The perimeter is each of the lengths added together. A hexagon has each of its sides equal. This means you can have the shortcut of multiplying length by 6.
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.