Arc length for continuous implicit differentiable functions

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We have a continuous differentiable function defined as $$F(x,y)=0$$And I am looking for a formula for its arc length between $x$ values $a$ and $b$. Doing a quick search, I could only find formulae for vector functions and functions with parametrizations. I was thinking of writing $y$ in terms of $x$ so that $F(x,f(x))=0$, but that will make this function a single variable and not a multivariable function as desired.