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16x-17

Step-by-step explanation:

Also you should get the app photo math you just take a pic of the problem and it will give you the answer, so then you dont have to get one here and wait for someone to answer you.

Step-by-step 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. Apothem = a segment that joins the polygon's center to the midpoint of any side that is perpendicular to that side.