Question

2011邵阳的题目,数学课堂上,徐老师出示一道试题

Answer 1

(2)成立. 在A1B1上截取A1H＝M1C1,连接M1H,易证△A1M1H≌△M1N1C1.

(3)∠AMN＝60°＝3－23×180°,

∠A1M1N1＝90°＝4－24×180°,

∠AnMnNn＝n－2n×180°.