This section is on continued fractions. It was a pretty cool chapter because I always thought that continued fractions were unwieldly, but the fact that when partial fractions converge each approximation can be proved to be better than the last one is really cool. It is a built in margin of error calculator.
My problem with the examples is it didn't show how to get a decimal representation of the number to use in the algorithm for creating a continued fraction. They approximated pi, but used pi to create the fraction that they used to approximate pi.
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