Answer:
Step-by-step explanation:
The full length of the line is 40mm. In a 1:2 scale, the new line would be 80mm long. This means that for each 1mm of the original line, you need to draw 2mm on the new line. Therefore, the relationship between the full length of the line and the new line you drew is that for each 1mm of the original line, you need to draw 2mm on the new line.