Not true. If you define the circumference in terms of pi, you can define the circumference exactly.
Let’s say you got a circle with radius 1/π…
The circumference of a circle with a diameter of 1 cm is exactly π cm. There you have it.
Easy. Take a wire that is exactly 1 meter long. Form a circle from the wire. The circumference of that circle is 1 meter.
More likely a mathematician would correct you instead of crying. Pi is not infinite, its decimal expansion is infinite!
Plus even that isn’t enough: 10/3 has an infinite decimal expansion (in base 10 at least) too, but if π = 10/3, you’d be able to find exact circumferences. Its irrationality is what makes it relevant to this joke.
A mathematician is also perfectly happy with answers like “4π” as exact.
Plus what’s to stop you from having a rational circumference but irrational radius?
Writing this, I feel like I might have accidentally proved your point.
Mathematicians taking a physics class and being told they have to round things. That’s when the tears start flowing.
Pi is 3.
Ah, the Euler identity. 3^i ^3 -1=0
Rofl :D Well, close enough, and about as sexy when a bit drunk.