All roads lead to Rome, no matter how to prove a geometric problem. As long as the thinking is correct, the process reasoning logic is rigorous and the conclusion is correct, it can be. Your thinking is right and your conclusion is right, depending on whether the process reasoning logic is rigorous.

According to your idea, I hereby certify the following for your reference:

Pass p stands for PM⊥AD, cross AD stands for m, pa = pd, ma = MD.

Connect BM, abcd is a diamond, ∠ Bad = 60, ∴⊿ABD is an equilateral triangle, ∴BM⊥AD.

∴AD⊥ Port and Maritime Bureau

At ⊿pbc∫e and F are the midpoint of PC and BC respectively, ∴∫e, F//Pb.

⊿CBD is an equilateral triangle, ∴DF⊥BC,∴DF//BM.

∴ surface PMB// surface DEF== >AD⊥ surface definition