Is it true that if inside a [circular segment][1] $S$, with vertices $a$ and $b$, we take two circular arcs, one from $a$ to $c$ and the other from $c$ to $b$, then the sum of the lengths of these two arcs will be always at most the length of the arc from $a$ to $b$ on the boundary of the original circular segment?

Note that I do not require the two smaller arcs to have the same center, but I want both to be strictly contained in $S$.


  [1]: https://en.wikipedia.org/wiki/Circular_segment