9 can be used in geometry in order to find a perfect square. 9 is also a square number witch is important when trying to calculate traingle sides by using the pythagareon therom.the square root of 9 is 3 and 9 squared is 81
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There may be some hidden agenda in this question. Why would 9 not be a real number?
It is not a real number.
Any number, real or imaginary, can be the sum of another number plus 9.
The roman numeral for number 9 is: IX
It's 9.