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[几何] 一个初中几何竞赛题

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realnumber Post time 2014-12-30 09:56 |Read mode

QQ图片20141218104603啊.jpg

特殊到一般，先1根，再3根，5，。。。。

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爪机专用 Post time 2014-12-30 10:10

等差

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kuing Post time 2014-12-30 11:33

续楼上：

要么出去：
QQ截图20141230113210.gif

QQ截图20141230113210.gif

要么回来：

QQ截图20141230113320.gif

总有 $\angle(n+1)=\angle n+\angle A$

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