Respuesta :

TheLazyNobita

In triangle ABC and triangle ADE

angle A = angle A (common)

angle ABC = angle ADE

By AA similarity criterion , they are similar

Thus

AB/AD = BC/DE

4/12 = x/12

Thus x = 4

Cherry084

Answer:

4

Please see the photo I added, if you do not understand, specify in the comments...

Ver imagen Cherry084