when they can connect
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If you know the end points then use the distance formula or simply use a ruler.
The height of the land, and the scale of the map
At the end of the line there needs to be two points. Measure the line and divide by two.
Not linearly related.
Points cannot be parallel to other points. A straight line joining two points is parallel to a straight line joining another pair of points if the gradient (slope) of the two lines is the same.