Incentre of a triangle
1)The co-ordinates of the vertices of a triangle are (4, - 3), (- 5, 2) and (x, y). If the centre of gravity of the triangle is at the origin find x, y. 
  

2)The angle bisectors of a triangle are concurrent. Their common point is the. 
  

3)The point of concurrency for angle bisectors in a triangle is 
  

4)A line, segment, or ray that passes through the midpoint of an angle 
  

5)Circles are drawn having the sides of triangle ABC as their diameters. Radical centre of the circles is the