That is one reason I don't like D&D, it is a glorified boardgame the hides it's wargame roots under a very thin layer. I like tactical rpg on the computer but investing that level of math and detail in a pen & paper game is so boring, for me at least.
But D&D uses Chebyshev distance, not Euclidean. No need for Pythagoras. And Pathfinder alternates between Chebyshev and Manhattan to approximate Euclidean.
If the range of Bless is 30ft and the Cleric is 30ft in the air, then any non-zero horizontal distance would technically put them out of range. You don't need to calculate that they are 36.06ft away to know if they are out of range or not.
But do their feet need to be in range or just a single part of their body?
Depends on which part of them needs to be blessed?
Do some people actually playing RPG care that much about range ? Rather than some guesstimate ?
I actually find the Ryuytama range management pretty cool, where you simply say whether your character is at contact/short-range/long-range/away and that's it.
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