如图，已知AEBF，AC⊥AE，BD⊥BF，AC与BD平行吗？补全下面的解答过程（理由或数学式）．

解：∵AEBF，

∴∠EAB＝                  ▲                   ． （                  ▲                  ）

∵AC⊥AE，BD⊥BF，

∴∠EAC＝90°，∠FBD＝90°．

∴∠EAC＝∠FBD（                  ▲                  ）

∴∠EAB﹣                  ▲                  ＝∠FBG﹣                  ▲                   ，

即∠1＝∠2．

∴                  ▲                                    ▲                  （                  ▲                  ）．