startX = 0
startY = 0
angleOffset = 135
r = 1
angleStart = 110

startSketchOn(XY)
  |> startProfile(at = [startX, startY])
  |> angledLine(angle = angleStart, length = .000001)
  |> tangentialArc(angle = angleOffset, radius = r, tag = $arc1)
  |> tangentialArc(angle = angleOffset, radius = 0.5 * r, tag = $arc2)
  |> tangentialArc(angle = -angleOffset, radius = 0.5 * r, tag = $arc3)
  |> xLine(endAbsolute = 1)