In $\triangle A B C, \angle A=60^{\circ}, \angle B=80^{\circ}$ and the bisectors of $\angle B$ and $\angle C$ meet at $O$. Find (i) $\angle C$ (ii) $\angle B O C$.
In each of the following, the measures of three angles are given. State in which cases, the angles can possibly be those of a triangle: (i) $63^{\circ}, 37^{\circ}, 80^{\circ}$ (ii) $45^{\circ}, 61^{\circ}, 73^{\circ}$ (iii) $59^{\circ}, 72^{\circ}, 61^{\circ}$ (iv) $45^{\circ}, 45^{\circ}, 90^{\circ}$ (v) $30^{\circ}, 20^{\circ}, 125^{\circ}$