回复：乱弹 和 LyingKing 作图法引出的“圆规直尺做图题”

设AB为最长，任作一小正方形，其一边在AB上，其一个顶点在AC上，设另一不在AB的顶点为F, 放大此三角形，即延长AF交BC为H，过H作AB的平行线交AC为I,过H作AB的垂线交AB为K,过I作AB的垂线交AB为J,HIJK即为所求正方形。

所有跟帖： 

• 纠正：'放大此三角形'改为'放大此正方形' -LyingKing- ♂ (0 bytes) () 09/22/2007 postreply 06:51:25

• 精彩呀。 -也和话- ♂ (0 bytes) () 09/22/2007 postreply 08:19:12

• this is so wrong! -Commentate- ♂ (0 bytes) () 09/24/2007 postreply 11:50:24

• Can you back it up with a reason? -也和话- ♂ (0 bytes) () 09/24/2007 postreply 22:28:15

• if you try to draw in his way, you will see. -Commentate- ♂ (0 bytes) () 09/25/2007 postreply 06:36:39

• I doubt you didn't draw it follow my instruction. -LyingKing- ♂ (0 bytes) () 09/25/2007 postreply 07:21:31

• 回复：I doubt you didn't draw it follow my instruction. -Commentate- ♂ (234 bytes) () 09/25/2007 postreply 08:40:49

• It's easy to prove H is unique whatever the small square you dra -LyingKing- ♂ (0 bytes) () 09/25/2007 postreply 09:10:32

• Oops, my bad. -Commentate- ♂ (0 bytes) () 09/25/2007 postreply 08:46:16