It depends on what information you DO have.
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A regular hexagon can be divided into 6 equilateral triangles by drawing diagonals between opposite vertices, if that helps.
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
It is a regular hexagon.
The length of on side of an equilateral hexagon is half the diameter of the circumscribing circle.