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but isn't there some formula use for this or do you just do it that way?

yep, but from here its just triangulation... as it's 2 right angled triangles if u look at it the right way
so i'd use the Sine Rule for these ones (see attached)

ohh okay thanks again I have like 3 or 4 more lol sorry but thanks for the explanation!

nah wait hang on: easier to use SOH CAH TOA for these (right angled, my bad - duh-moment)

sine (o) = opposite / hypotenuse... etc

okay thats what I thought haha