By far the most popular and well-stocked category of used instruments is our selection of guitars, where we've got a huge variety of all the big names. Used Gibson Les Paul, pre-owned Fender Telecaster and secondhand Stratocaster guitars are commonly found within these pages, waiting for their new homes with players and collectors.
22/7 is a pretty decent choice for teaching 11-year-olds about fractions that are close to pi. 355/113 would be better, if you think they can remember numbers that big. And approxRational is fun. Exercise for the interested reader: implement an inverse to approxRational.
Pi is an irrational number, this means that it cannot be expressed as a fraction, also it can be deduced that Pi cannot be represented as terminating or repeating decimals. Secondly, rational * rational â  irrational, therefore, the square root of pi must be irrational as well. Ï â 3.1415926535897932384626433832795. âÏ â 1.7724538509055160272981674833411. A calculator gives the above estimates.