jawablah pertanyaan ini!

*ADC*
AD^{2} = AC^{2} + CD^{2}
13^{2} = AC^{2} + 12^{2}
169 = AC^{2} + 144
169-144 = AC^{2}
25 = AC^{2}
AC = 5

*ABC*
AC^{2} = AB^{2} + BC^{2}
5^{2} = 4^{2} + BC^{2}
25 = 16 + BC^{2}
25-16 = BC^{2}
9 = BC^{2}
BC = 3
Jawabannya adalah b. 3cm