[請益] 請問如何切割出圓角的方形
問題：
小弟想在塑膠板挖出圓角的方形當窗戶, 如下圖的左邊紅色長方形
http://www.badongo.com/pic/10366828
但是只用刀子或電鑽切割都只能切出右邊直角的長方形
想請教大家有什麼方法可以做得到
謝謝
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