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i know its simple math, i just can't remember how to do it. lets say i have 2 points on my map, and want to see the distance between those 2 points in units but they differ in X and Y.

now i use the block tool as a ruler, and see how many X and how many Y units it takes to get to the points, 200 X and 350 Y, but what do i do with these two values to calculate how many units it is diagnolly? does that make sense?
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