If the perimeter measure 20" then each side is of length 5".
Let D be the diagonal.
Using Pythagoras' Theorem. D² = 5² + 5² = 25 + 25 = 50
Then D = √50 = 5√2 = 7.071" (3dp)
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The perimeter of this square is 56.569 meters.
Using Pythagoras the diagonal is 20 times square root of 2
Perimeter is length or distance (inches, feet, meters). Area is square units (length2 : square inches, square feet, square meters), so to say that one is larger than another is not relevant. If it's a 1 by 1, then the perimeter is 4 and the area is 1. But if the square is 5 by 5, then it has a perimeter of 20 and an area of 25. It depends, good luck.
A square with an area of 20 acres has a perimeter of about 3,733.5 feet.
A 20-acre square lot has a perimeter of 3,733.52 feet.