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三视图中的许多题目求解的思路不难,但由于不少同学对三视图理解不深,或未能掌握三视图画法的要领,常常出现各种各样的错误.因此,这里借助中考题,给学生提个醒儿——解三视图问题要且解且谨慎.一、注意组合几何体的摆放位置例1(2014年河南)将两个长方体如图1放置,所构成的几何体的左视图可能是()分析对于组合几何体这类较综合的问题,除熟悉各常见几何体从不同方向看得到的平面图形外,还需考虑各个几何体的放置位置.
Many ideas in the three views are not difficult to solve, but many students often encounter various mistakes due to their poor understanding of the three views or their inability to master the three-view drawings. , To give students a wake up - solution to the three view problems to be solved and cautious. First, pay attention to the combination of geometry placed in place Example 1 (Henan 2014) Place two cuboids as shown in Figure 1, the left The view may be () analysis. For the more general problem of combining geometry, in addition to familiar with the common geometry of the plane from different directions to see the plane, but also need to consider the placement of each geometry.