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Gwen smiled slightly, an odd closed curve of the lips.

The track need not be a closed curve; the starting and finishing lines could be different.

A periodic motion is a closed curve in phase space.

In the case of a closed curve it is also called a contour integral.

The intersection resembles a figure eight: it is a closed curve which intersects itself.

In geometry, circumference is the distance around a closed curve; for example, a circle.

Another example is: Find the smallest area surface filling in a closed curve in space.

The analemma is then a closed curve, which does not change.

Specifically, a closed curve on a plane is needed.

However circumference may also describe the outside of elliptical closed curves.