
Re: Trying to find perimeter of a regular pentagon
Posted:
May 28, 2013 10:30 PM


or, diaidians; circumference is pi D diadians; area of sphere is pi DD diadians; so, it is actually two things, not really dimensionless.
> I might guess radians appeared very close to the time > of Euler... (yet, maybe already calculus uses > radian measure preferably, to get d/dx sin(x) = cos(x). )

