Explanation:
To find the area of a regular polygon, all you have to do is follow this simple formula: area = 1/2 x perimeter x apothem. Here is what it means: Perimeter = the sum of the lengths of all the sides.
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Here is what it will look like:
area = 1/2 x 120 x 10√3.
area = 60 x 10√3.
area = 600√3.
hope this helps