A radius gauge takes the guesswork out of designing or duplicating a part, no matter what size.
Arc Master Radius Gauges
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The question is misguided. You do not use radius only on circles!
The radius symbol is R. You could use this in: Radius = πr²
Use: 2*pi*radius = circumference
you double the radius to find the diameter.
Area of circle = pi*(radius)2