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  • 1. (2021七上·净月期末) 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.

                      ▲                                    ▲                                    ▲                  ).

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