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It is Pythagoras' theorem that is applicable to any right angle triangle.
Probably because most countries in Europe and north Africa were still under Roman rule.
12 second rule
In its simplest form, l'Hôpital's rule states that for functions f and g which are differentiable on I\ {c} , where I is an open interval containing c:If, and exists, and for all x in I with x ≠ c,then.^from wiki
iteration