正立方體與截平面
拉動start開始，移動P,Q,R三點觀察通過這三點的平面與正立方體所截的圖形
This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com
藍邦偉 老師, 製作軟體：
GeoGebra