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The side is square root of 40.5. ( approximately 6.363961...)

The diagonal is 6.363961...times the square root of 2, because of the Pythagorean formula of a^2+b^2=c^2

a^2+a^2=c^2 square has identical sides.

2a^2 =c^2

a * sqr 2=c square root both sides of the equation.

a is the side of the square. So,

6.363961... times sqr 2= 9

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Q: What is the length of the diagonal of a square with area 40.5 square inches?
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