The length of a line is not necessarily a practical value as a line goes on for ever. The length of a line is infinite. However, the length of a line segment is of more value and is a finite value. Any time we measure how long a package is or how long our table is, we are taking the length of a line segment. Learn the formula for finding the length of a line segment when given two points in either 2 dimensions or in 3 dimensions.
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There are many ways to combine functions. One of the ways is a function within another function of the composition of two or more functions. This is a little like nested functions. Learn more about the composition of functions and practice composing different functions.