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Q: Is the square root of 441 a rational number?

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Yes, they are.

21The square root of 441 is 21

441 square root

It is 21

21

441 has two square roots; 21 or -21.

12

21

i21 = square root of (-441)

If the reverse square root of the reverse of square of a number is the number itself then it is Adam Number. For ex., 12 and 21 Take 12 square of 12 = 144 reverse of square of 12 = 441 square root of the reverse of square of 12 = 21 The reverse square root of the reverse of square of 12 = 12, then number itself. Such number is called Adam Number. cool....................

plus or minus 21

length x length = area length = square root of 441= 21 inches

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