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  • 1. (2021七上·龙凤期末) 如图,ABCD,∠BMN与∠DNM的平分线相交于点G,

    完成下面的证明:

    ∵MG平分∠BMN,

    ∴∠GMN=∠BMN(                                    ▲                                           ),

    同理∠GNM=∠DNM.

    ∵ABCD

    ∴∠BMN+∠DNM=                  ▲                                          ▲                        ).

    ∴∠GMN+∠GNM=                  ▲                        

    ∵∠GMN+∠GNM+∠G=                  ▲                        

    ∴∠G=                  ▲                        

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