One eighth inch drop per foot of run.
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You have to know the slopes of both lines. -- Take the two slopes. -- The lines are perpendicular if (one slope) = -1/(the other slope), or the product of the slopes equals to -1.
You can use the formula: y=mx+b (berdill)
If the lines are straight and have the same slope they are parallel, no matter what the y intercept is
They're parallel if their slopes are equal.
The smaller lines approx. 3/16" at the side of the radiator