There is no simple formula for the surface area of a general hexagon. The simplest solution is to partition it into triangles, calculate their areas and sum the results.
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Area of triangle = ½ base x altitude. Regular hexagon is 6 equal triangles so Area= 3 x base x altitude
(3x2 √3) / 2 Where x is the length of a side, given that the hexagon is a regular hexagon. However, if the hexagon is is not regular, you will have to find the area of the two trapeziums within the hexagon, find the area of them, and add them together.
The area of a hexagon with a given side of 20 is 1,039
The area of a hexagon with a given side of 20cm is 1039.2cm2