When do you use the dotted line in math? When should I use a solid line? Tangled!
There are many situations. As the downstairs replied: draw a solid line that you can see and a dotted line that you can't see. For example, draw a cube, or some 3D graphics (there is always a hidden side, so if you want to express its outline, use a dotted line). Auxiliary lines must be drawn as dotted lines, as the name implies, which are line segments used to help you solve problems. ...