How to draw cad drawings?

Do as you say with CAD, and use pl line, bit by bit.

CAD line drawing should be ok, right?

Let's talk,

Enter "pl"-space-click the first point of a straight line on the map with the left mouse button-click the second point-,,,,-space, and a straight line will be drawn. Other steps are the same.

The most crucial point: about the numerical problem, the diagram you looked up. You can zoom in and out, but how big it is, it should be aligned according to the proportion on the picture, and it can meet the requirements after the calculation and scaling (sc) operation.