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1例题引入立体几何课本P77例4为已知一个圆锥的底面半径为R，高为H，在其中有一个高为x的内接圆柱．（1）求圆柱的侧面积；（2）x为何值时，圆柱的侧面积最大？（解答过程略）教学时我们先让学生看这道例题及其解答过程，然后让学生独立思考，积极主动地去探索总结解决这类问题
An example of the introduction of a three-dimensional geometry textbook P77 Example 4 is known for a cone with a radius of R on the bottom and a height of H, in which there is an inscribed cylinder with height x. (1) Find the lateral area of the cylinder; (2) When the value of x is the maximum area of the cylinder? (An explanation of the process is omitted.) We first let the students see this example problem and its solution process during the teaching. Then let the students think independently and actively explore and solve such problems.