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Neither because the square root of 400 is 20
No, it is neither.
21.447610589527216 (does not repeat to 20 places)
What you are asking is, "What is the square root of 20?" The answer to 9 decimal places is 4.472135955
Each side of the square is 20 inches and by using Pythagoras' theorem its diagonal is 20 times the square root of 2 which is about 28.284 inches rounded to 3 decimal places.