Curve Orientation -- from Wolfram MathWorld
- ️Weisstein, Eric W.
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A curve has positive orientation if a region 
is on the left when traveling around the outside of 
, or on the right when traveling around the inside of 
.
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Cite this as:
Weisstein, Eric W. "Curve Orientation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CurveOrientation.html