正(长)方体是一个很基本的多面体,所含线线、线面、面面的位置关系的内容十分丰富,通过构造正(长)方体解题,思路自然,方法简捷.下面以高考题为例予以说明.1.由正四面体构造正方体例1一个四面体的所有棱长都为2~1/2,四个顶点在同一球面上,则此球的表面积为() Positive (long) cuboid is a very basic polyhedron, containing very rich contents of line, line, and face position relationships. By constructing positive (long) cuboids to solve problems, the idea is natural and the method is simple. The college entrance examination questions are used as an example to illustrate. 1. Constructing a cube with a regular tetrahedron Example 1 All tetragonal prisms have a length of 2 to 1/2. If the four vertices are on the same sphere, the surface area of ​​the sphere is ()