| The essay is about the teaching research into the relations between the definition geometrize nature and circular cone , in which the teaching research of definition mainly uncovers the nature of circular cone;geometry nature about how to lead the students to understand the geometry nature of circular cone with equations in the thought of figures and shape. The essay focuses on the relationship between line and circular cone, andmainly discusses 5 most typical problems------the basic chord length formula, themidpoint of common chord, the relations between line and circular cone, aiming to have the students grasp the two basic ways of seeking chord length and mid-point of chord, including the analysis of five typical problems, the law of thought and basic approaches. Finally, it analyse the usual problems, the reasons for the problems, and make some appropriate improvements.
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