Curvature is a general term to describe a graph. Like, concave or convex.
Radius of curvature is more exact. If the curve in a 'small' section is allow to continue with the same curvature it would form a circle. that PRETEND circle would have an exact radius. That is the radius of curvature.
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1/aAccording to Wikipedia,"The canonical example of extrinsic curvature is that of a circle, which has curvature equal to the inverse of its radius everywhere. Smaller circles bend more sharply, and hence have higher curvature. The curvature of a smooth curve is defined as the curvature of its osculating circle at each point."
The filet is part of the radius, therefore making the term filet radius. A filet radius measures an inside corner. A corner radius measures an outside corner.
radius is half and diameter is the whole Expanding theabove statement: Diameter is the width of a circle; Radius is one half the width. In math, the radius refers to the distance from the centerpoint of a circle out to the edge.
It is 42 inches.
Simply cop a feel... Blind-guessing and groping seem to work quite effectively. Hope this helps!