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题型:解答题 题类:常考题 难易度:普通

吉林省长春市长春净月高新技术产业开发区2021-2022学年七年级上学期期末数学试题

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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