Shadow, similar triangles and height of trees

Analyse the model below and explain how we can find the height of trees and building using the shadows and triangles.
– --- Italian Team: Nicoletta Bucigni, Stefano Loschi, Monia Mattiacci, Antonella Pignatelli ---, Ingrid Delange, Profs de math de la CSMV

Information: Shadow, similar triangles and height of trees