In $\triangle \mathrm{ABC}$, if ' $\mathrm{S}$ ' is the circumcentre and ' $\mathrm{O}$ ' is the orthocentre…
In $\triangle \mathrm{ABC}$, if ' $\mathrm{S}$ ' is the circumcentre and ' $\mathrm{O}$ ' is the orthocentre then $\overline{O A}+\overline{O B}+\overline{O C}=$