10.222=10 and 222/1000
I'm not sure if that's what you were looking for but I hope this helps!
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Formula
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a² + b² = c²
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Find Diagonal
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9² + 7² = c²
c² = 81 + 49
c² = 130
c = 11 in (Nearest whole number)
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Answer: The diagonal measure 11 inches
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A^2+b^2=c^2
Is the Pythagorean theorem