Respuesta :

The arc length (s) is given in terms of the radius by
  s = rθ
  10 cm = r*(29/180*π) radians
  r = (10 cm)*(180/(29π)) ≈ 19.757 cm

d = 2r ≈ 2*19.757 cm ≈ 39.51 cm . . . . . . . matches selection G