In our previous two videos on line integrals (see vector calc playlist below) we focused on curves that lived in the xy-plane; that is, they were 2D curves and had a function "above" them. This gave a pleasing geometric interpretation. However, the curves can be 3D (or more) just as easily and in this video we will slightly adjust the formula to accommodate the extra dimension. While these are harder to graph, they have many nice applications such as the total mass of a variable density wire, the total volume of a variable diameter wire, and arclength of a curve. Plus, in future videos, we will see these are crucial for studying curves in a vector field.
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