If the length of segment ab is 1/3 the length of segment ac and if segment ac is 12 cm long, how long is segment bc?

First we will find the length of AB which is 1/3 the length of AC.

AB = 1/3 * 12 = 4

So AB is 4 and AC is 12 so we can subtract AB from AC to find BC.

12 - 4 = 8

So BC is 8.

Hope this helps :)