论文部分内容阅读
国家教育部推荐的教育软件《几何画板》能提供曲线的动态变化,便于观察与验证。如很好地开发它的功能,制作出富于动态效果的课件,对学生理解抽象曲线和提高想象能力将有极大的帮助。下面以绘制椭圆曲线的八种方法与同行们探讨《几何画板》的应用。一、定义法(到两定点的距离和等于定长) 选取“线段”工具,在绘图板中作一线段AB(线段AB的长度为椭圆的长轴长2a)。用“点”工具在线段上任取一点C,按住shift键先后选中A,C点,选择“变换”→“标记向量”A→C””。
The education software “Geometric Sketchpad” recommended by the Ministry of Education can provide dynamic changes in the curve for easy observation and verification. If you develop its function well and produce rich dynamics courseware, it will help students to understand abstract curves and improve their imagination. The following eight methods of drawing elliptic curves and their peers explore the application of “Geometric Sketchpad”. First, the definition method (distance equal to the fixed length of the two fixed points) Select the “Line segment” tool and make a line segment AB in the drawing board (the length of the line segment AB is the long axis length of the ellipse 2a). Use the “dot” tool to take a point C on the line segment, hold down the shift key to select A, C points, and select “transform” → “marker vector A→C””.