Answer:
BC = 3.6 cm
Explanation:
It is given that, point B lies on segment AC. It means that,
AC = AB + BC
We have, AB = 4 mm and AC = 4 cm
1 mm = 0.1 cm
4 mm = 0.4 cm
It means that,
4 cm = 0.4 cm + BC
BC = 4 cm - 0.4 cm
⇒ BC = 3.6 cm
So, the value of BC is 3.6 cm.