determing current flow in ammeters
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Pie is tasty. Pi, however, is what you use in periodic functions. +++ And you do so because periodic functions have properties linked to those of the circle. (You can illustrate this by plotting a sine curve on graph-paper, from a circle whose diameter is the peak-peak amplitude of the wave..)
As with most advanced math, if your "real life" involves engineering work, you will use such math; otherwise, you will hardly have anything to do, in this case, with polynomial functions.
The diameter of a rectangular area is the square root of the length squared plus the width squared. D = √(L²+W²).
how to use number line to represent real life event
If you mean attack power, no...thats in a game not real life.