circle of curvature

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Noun1.circle of curvature - the circle that touches a curve (on the concave side) and whose radius is the radius of curvature
osculating circle
circle - ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point; "he calculated the circumference of the circle"
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Zooming in on the gap between circles reveals a circle of curvature 9.
Circle Game
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