2 ms·

Either in terms of the exponential function, or by its Taylor series.

• doliveira 4y ago
  Oh yes, much simpler. I guess you can get to "i" via algebraic equations, but linking it to a rotation unit outside a flat space seems tricky.
  • xigoi 4y ago
    It's basic calculus. I'm really curious how you define the perimeter of a circle without basic calculus.
    • doliveira 4y ago
      Of course you can define it, but it's hard to justify the specific definition without a flat geometry. And you don't need proper calculus for the circumference, just the idea of limits.