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[几何] 睿智的木匠

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isee posted 2013-6-25 11:05 |Read mode
2013温州中考

一块矩形木板(图中矩形$ABCD$),它的右上角有一个圆洞,现设想将它改造成火锅餐桌桌面,要求木板大小不变,且使圆洞的圆心在矩形桌面的对角线交点上.木工师傅想到了一个巧妙的办法,他测量了$PQ$与圆洞的切点$K$到点$B$的距离及相关数据(单位:$cm$)后,从点$N$沿折线$NF-FM$(图中$NF\sslash BC$,$FM\sslash AB$)切割,如图左所示.右图中的矩形$EFGH$是切割后的两块木板拼接成符合要求的矩形桌面示意图(不重叠、无缝隙、不计损耗),则$CN$,$AM$的长分别是__________.

snap.png

好像数字看不清,上面是50面,再给个网上的图

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original poster isee posted 2013-6-25 22:00
2013 北京中考

类题,变化的平移
2013bjzk-t22.png

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original poster isee posted 2013-7-1 01:47
755 不来玩下几何?

好多角度可解,还是有意思的

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