The answer is: 1372 in. squared 
Because the apothem will always be half of the length of one side. The length of one side is 28 in. 
The formula for the area is: 
Area = (number of sides × length of one side × apothem)/2
Working out: 
A = (7 times 28 times 14) divided by 2 = 1372 in. squared 
Hope this helps! 
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