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Verifying Workspace Squareness
An office furniture installer is setting up a corner workstation. To ensure the desk is perfectly square (forming a 90-degree angle), they measure 3 decimeters along one wall and 4 decimeters along the other. According to the '3-4-5 rule,' what must the diagonal distance (the hypotenuse) between these two marks be to confirm the corner is square, and what is the name of the mathematical theorem used to justify this result?
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