The analysis and summary, confirm is application and compare it with the traditional Internet-aiding point conic teaching.

第三部分是分析总结，确定其适用性，并和传统的多媒体辅助圆锥曲线教学进行了比较。

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A study on the method of drawing conic normal lines through a given point outside the conic.

本文就过圆锥曲线外的点作其法线的方法进行研究。

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Thus, we give a make-graph method of conic section on plane with arbitrary point as foci, arbitrary line as directrices and arbitrary positive number as eccentricity.

从而给出了以平面上任意点为焦点、任意直线为准线，任意正数为离心率的圆锥曲线的直接作图方法。

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