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我一般是這麼畫的: 先畫半徑為2700,任意弧長的一段圓弧,起輔助作用; 然後再用畫圓弧命令,要先定圓心,再確定起點,這些都與原先畫好圓弧位置重合.接下來關鍵一步確定圓弧終點:光標沿預先畫好的圓弧慢慢移動以捕捉到其軌跡,捕捉到后(出現白色小叉)命令欄輸入4241,回車確定.最後將原來的輔助圓弧刪掉.
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