※ 引述《ducksky (鴨舞九天)》之銘言:
: http://imageshack.us/photo/my-images/69/49251952.png/
: 大意主要是說在L找一點B使得AB=BC
: 請問要怎麼做圖呢?
設L和M交於 D點
連接 AD 直線
在M上任取一點C'
過C' 做M的垂線交L 於 B'
____ ____
做B'A' = B'C' 其中A'在AD直線上
____
過A做 B'A'的平行線交L於B點 B點即為所求
__ __
過B做M的垂線交M於C點 則AB = BC (自己證明吧 hint:平行截線段)
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