22.如图11.∠5=∠CDA =∠ABC.∠1=∠4.∠2=∠3.∠BAD+∠CDA=180°.填空: ∵∠5=∠CDA ∴ // ∵∠5=∠ABC ∴ // ∵∠2=∠3 ∴ // ∵∠BAD+∠CDA=180° ∴ // ∵∠5=∠CDA.又∵∠5与∠BCD互补 ∠CDA与 互补 ∴∠BCD=∠6 ∴ // 查看更多

 

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如图11,∠5=∠CDA =∠ABC,∠1=∠4,∠2=∠3,∠BAD+∠CDA=180°,填空:

∵∠5=∠CDA(已知)

      //       (                       )                             

∵∠5=∠ABC(已知)

      //       (                       )                              

∵∠2=∠3(已知)

      //       (                        )                               

∵∠BAD+∠CDA=180°(已知)

      //       (                           )  

∵∠5=∠CDA(已知),又∵∠5与∠BCD互补(                            )

∠CDA与           互补(邻补角定义)

∴∠BCD=∠6(                        )

       //        (                              )

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