How do you name the sides of a polygon in CeTZ?

Questions
,
1

My code is:

#import "@preview/cetz:0.5.2"
#import cetz.draw: *

#cetz.canvas({
  hide(circle((2,0), name: "circle", radius: 1))
  line((1,0), (3,0),           name: "a")
  line((), "circle.120deg",    name: "b")
  line("circle.120deg", (1,0), name: "c")
  content("a", [a], anchor: "north")
  content("b", [b], anchor: "south-west")
  content("c", [c], anchor: "south-east")
})

Result:

image
image831×511 15.9 KB

Is there no way to replace the three line commands with a single one — like line((1,0), (3,0), "circle.120deg", closed: true) — while also naming each line so that the polygon’s sides can be labeled?