An ellipse is a conic section which is a closed curve.
A circle is a special case of an ellipse.
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The first order continuity curve is a term used in geometry to describe parametric first derivatives that are in proportion at the intersection on at least two successive sections of the curve.
GREEN'S THEOREM: if m=m(x,y) and n= n(x,y) are the continuous functions and also partial differential in a region 'r' of x,y plane bounded by a simple closed curve c. DIVERGENCE THEOREM: if f is a vector point function having continuous first order partial derivatives in the region v bounded by a closed curve s
curve is an action verb
The word curve can be used as either a verb or a noun. As a verb: when you throw a ball, its path will curve downward, because of gravity. As a noun: the equation can be drawn on the graph as a smooth curve.
The curve of your thumb is the part where it looks rounded, at the base of your thumb.