Pi isn't 3.14, so memorizing 6.28 doesn't make working with equations any easier. You're generally not going to want to convert it to a rounded number until the very end of whatever you're doing if at all.
If pi were double what it is... a quadrant of a circle would be a quarter pi radians, a third of a circle a third pi radians... wouldn't that make so much more sense when teaching the meaning of pi and the unit circle to kids???
Just look at all the important series and formulas of math and physics... fourier series, gaussian normal distribution, ampere's law, coulomb's constant, planck's constant, the sum of the exterior angles of all polygons, the periods of sin and cos... look at all those extra 2's to make up for a bad definition of pi! So much work and learning would be simplified if the extra coefficient were gone.






and then you have to divide if you need just one with your system. I do not see why it would make it easier really, 2x3.14 is almost automatic 6.28 in one thought without trying really, unless you are not used to doing this in your head.



Make a square out of a circle

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