1. From the front, the geometric figure obtained is called the main view;From the back, the geometry is called the back view;
2. On the left hand side, the geometric figure is called the left view;On the right hand side, the geometry is called the right view;
3. From the top down, the geometric figure obtained is called the top view. From the bottom up, the geometric figure is called the elevation view;
4. In order to make the graphic expression more accurate, more readable and easy to understand, sometimes it is necessary to draw a section view, full section view, half section view, sectional view, etc.A section view, which is to cut it open, you see the graph;Full section view: it is all cut open to get the graph;Half section view, is to cut it half (not all cut open), get the geometric figure;So the sectional view is just to imagine that this object is breaking from here, and then you can express the view that you see after the break, which is the sectional view.