What do you mean by signed curvature??

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Can any one define "signed curvature" and explain it geometrically?

What are the difference between curvature and signed curvature?

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Intuitively, curvature is a positive number that describes how quickly a parametric curve is curving instantaneously. Signed curvature is either positive or negative, indicating that the curve is veering off to the right or the left, respectively. See this image: enter image description here