The surface gauge is useful when finding the center of a cross-sectional piece of a round section.
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Most of the current travels on the surface of the wire. The more strands the more surface area and the lower the effective resistance.
Jack was sure he'd filled the car with petrol, but he checked the fuel gauge just to be certain.
A radius gauge takes the guesswork out of designing or duplicating a part, no matter what size. Arc Master Radius Gauges
Either by the gauge size or using millimeters.
Surface area of a sphere = 4*pi*radius squared