This circle is in the interior of circle with negative curvature.
From the en.wikipedia.org
The canonical example of extrinsic curvature is that of a circle, which everywhere has curvature equal to the reciprocal of its radius.
From the en.wikipedia.org
The curvature of a smooth curve is defined as the curvature of its osculating circle at each point.
From the en.wikipedia.org
The curvature of a circle of radius R should be large if R is small and small if R is large.
From the en.wikipedia.org
In the first definition, the curvature of a circle is equal to the ratio of the angle of an arc to its length.
From the en.wikipedia.org
Lest we forget, a rainbow is an arc of a circle centred on the shadow of the viewer's head, and has the same curvature all the way around.
From the newscientist.com
Point B which appears due East from A will be closer to the equator than A. Thus the curvature found this way is smaller than the curvature of a circle of constant latitude, except at the equator.
From the en.wikipedia.org
The curvature of the fretboard is measured by the fretboard radius, which is the radius of a hypothetical circle of which the fretboard's surface constitutes a segment.