本源程序是用几何画板做的数学课件，文件为圆锥曲线共性，供高中数学教师使用。本课件参加自治区课件大赛获一等奖。-source is the Geometer's Sketchpad to do mathematics courseware, documents for the conic common for high school math teachers to use. The courseware participation in the autonomous courseware

简单画板：直线，圆，矩形。主要用鼠标在菜单的工具栏的图标框里选择这三种图形！-Simple drawing board: straight lines, circles, rectangles. Main menu with the mouse icon in the toolbar box to select these three graphics!