1. The problem statement, all variables and given/known data In ΔABC the cooridnates of the vertex A are(4,-1) and the lines x-y-1=0 and 2x-y=3 are internal bisectors of angles B and C then radius of incircle of ΔABC is 2. Relevant equations 3. The attempt at a solution I can solve the given two eqns to get intersection point which is (2,3). Finding the inradius requires me to calculate the distance from (2,3) to any side. For this I will need eqn of any one side. Now I can also find the 3rd bisector.