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the most common angle used in constructing building is 90 degree.
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It is commonly called a hierarchy.
commonly used tessellation shapes
The rule that requires surfaces to be guarded is commonly referred to as the "Guarding Rule" or "Machine Guarding Standard." In the United States, this is primarily outlined under the Occupational Safety and Health Administration (OSHA) standards, particularly 29 CFR 1910.212, which mandates that machines and equipment be equipped with proper guards to protect operators and other employees from hazards.