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tiredmistborn
Since it is in fact a square photograph, you divide the perimeter by four. Each side would then be 5 inches, and multiplying two of these sides, 5*5, would give you the area of 25 inches
A square has 4 sides so, area = l×w×h 

20 ÷ 4 = 5
 
5 × 5 = 25, dont forget that each side of a square have the same length

Area = 25in²