Length[vector v]: Length of a vector v
Length[point A]: Length of the position vector of A
Length[function f, number x1, number x2]: Length of the function graph of f between numbers x1 and x2
Length[function f, point A, point B]: Length of the function graph of f between two points A and B on the graph
Length[curve c, number t1, number t2]: Length of curve c between numbers t1 and t2
Length[curve c, point A, point B]: Length of curve c between two points A and B on the curve
Length[list L]: Length of list L (number of elements in the list)
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