Length Command

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Length[Vector]
Yields the length of the vector.
Length[Point A]
Yields the length of the position vector of the given point .
Length[Function, Number x1, Number x2]
Yields the length of the function graph in the interval [x1, x2].
Length[Function, Point A, Point B]
Yields the length of the function graph between the two points A and B.
Note: If the given points do not lie on the function graph, their x‐coordinates are used to determine the interval.
Length[Curve, Number t1, Number t2]
Yields the length of the curve between the parameter values t1 and t2.
Length[Curve c, Point A, Point B]
Yields the length of curve c between two points A and B that lie on the curve.
Length[List]
Yields the length of the list which is the number of elements in the list.

Note: Also see tool Distance or Length.

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