Connect AC, so that EF∑AC and AD are at F point E,

Then DF is what you want.

(2) According to the parallel projection, △ABC ∽ △FDE

Then BC BA = DE DF,

∴ Germany = BC? DF BA = 1.65× 12. 1. 1. 1≈ 18.2(m)，

That is, the height of the teaching building is about18.2m. 。