圆锥是初中数学涉及到的为数不多的几何体之一,其性质与展开图关联,这样就形成了平面与立体的交错,势必会涉及较多的公式定理,学习起来不易理清头绪.笔者对课本中的一组公式进行了改造和再加工,得出了一个结论,并发现其具有一定的解题功能,现将探究过程与读者分享!一、结论的产生如图1,根据圆锥的底面周长与圆锥展开后的弧相等这一性质,可得2πr=n/180°πl, Conic is one of the few geometry involved in mathematics in junior high school. The nature of the cone is related to the unfolding diagram, which results in the staggered plane and the solid. It is bound to involve more formula theorems, so it is not easy to learn the clues. A set of formulas in the textbook has been transformed and reprocessed, reached a conclusion, and found that it has a certain problem-solving function, the inquiry process is now to share with the reader! First, the conclusion of the production shown in Figure 1, according to the underside of the cone Circumference with the cone after the expansion of the arc of this property can be obtained 2πr = n / 180 ° πl,