论文部分内容阅读
近几年,动态立体几何问题越来越受到高考命题者的青睐,这些问题渗透了一些动态的点、线、面及有关元素变化的位置关系,给静态的立体几何题赋予了活力.在这些动态问题中,有一类是直角三角形绕一条直角边旋转,在求解这一类问题时,巧设角变量可巧妙沟通相关量的关系,顺利求解.这里选取二例说明.
In recent years, dynamic three-dimensional geometric problems more and more subject to college entrance examination candidates favor, these problems infiltrated a number of dynamic points, lines, surfaces and changes in the relationship between elements of the position, to the static three-dimensional geometry subject to the vitality of these One of the dynamic problems is the rotation of a right-angled triangle about a right-angle edge. In solving this type of problem, the angle variable can cleverly communicate the relationship between the related quantities and be solved smoothly. Two examples are given here.