视图和投影是几何的重要内容,也是新题型的好素材,主要新题型有:一、答案开放型例1(2014年汕尾卷)写出一个在三视图中俯视图与主视图完全相同的几何体.解析:球的俯视图与主视图都为圆,正方体的俯视图与主视图都为正方形,答案可以从球或正方体中任意选一个.温馨小提示:主视图、俯视图是分别从物体正面和上面看得到的图形. View and projection is an important geometric content, but also a good material for new questions, the main new questions are: First, the answer Open-type Example 1 (2014 Shanwei volume) Write a view in the top and bottom of the three views exactly the same Geometry. Analysis: The top and bottom view of the ball are round, square top view and the main view are square, the answer can choose any one from the ball or the cube. Can see the graphics.