5 inches
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1-13/16"= The tangent of half the degree X the radius of the elbow.
The take-off of an 8-inch 90 refers to the measurement of the distance from the centerline of a pipe or duct to the edge of the fitting at a 90-degree angle. Typically, for an 8-inch duct or pipe, the take-off dimension can vary based on the specific design and manufacturer, but it is generally around 6 to 8 inches. This measurement is crucial for ensuring proper airflow and fitting in HVAC or plumbing systems. Always check manufacturer specifications for precise dimensions.
111.0
1.0e3L
You take your ruler and put it along the edge you want to merasure, line the begining of the scale (0) up with the corner and read off the length at the other corner.