Respuesta :

Answer:

  3.6 cm

Step-by-step explanation:

If point B lies on segment AC, then the segment sum theorem applies.

Application

  AB +BC = AC . . . . . . . . . . the whole is the sum of the parts

  4.7 cm + BC = 8.3 cm

  BC = 3.6 cm . . . . . . . . . . . subtract 4.7 cm from both sides