[thaumasiotes]

> Also I could only find a reference for the circumference and was too lazy to derive the diameter from the circumference to avoid the ambiguity by making it clear which diameter I was referring to. (EDIT: Diameter is ~8.6km: `echo "pi=4*a(1);27/pi" | bc -l`.)

...is the LHC track a circle?

[rnestler]

Not a perfect circle. It consists of multiple arc segments and the detectors which are straight. See also https://home.cern/science/accelerators/large-hadron-collider