Distance between two linear graph in specific domain

[#1]

Hello there,

Let's say for exmaple I have two linear line that I want to measure the distance between them in specific domain.

I've attched a scratch. The domain is the orange square. The distance between there is way smaller than the distance on X axis.
How can I calculate it in JMP?

[#2]

Sometimes using the ruler you can find from the toolbar can be enough.

Which distance do you wish to calculate? Don't you have infinite amount of distances inside the orange square?