Respuesta:
BC = 6 cm
Explicación paso a paso:
AC = 20 cm
BD = 16 cm
AD = 30 cm
BC = x
|------------------------------------ 30 ------------------------------------|
|------------------- 16 ------------------|
|--------------------- 20 ---------------------|
|----------------- 14 --------------|---- x ----|
__________________________________________
A B C D
x = 6 cm
