analytical geometry, help with excenter

[ice.rock]

hi could you please help me out in finding the coordinates of ex center opposite any one specific vertex lets say A. Assuming the excenter is I1 or I2. I fail to find the ratio in which the excenter point externally divides the the bisector.
Could somebody please help. and yes we have to use section formula here.

 

[Deleted member 4993]

hi could you please help me out in finding the coordinates of ex center opposite any one specific vertex lets say A. Assuming the excenter is I1 or I2. I fail to find the ratio in which the excenter point externally divides the the bisector.
Could somebody please help. and yes we have to use section formula here.

Take a look at:

http://mathworld.wolfram.com/ExteriorAngleBisector.html

 

[ice.rock]

Thanku for respnding. I want to find co ordinates using section formula, iknw this page you posted ,and couldnt find any help there. I did pretty extensive google search before posting ,i find the coordinates formula,ineed its derivation. What i cant undrstand is how excentre I divides the bisector in the same ratio as incentre. Looking at the diagram i am failing to determine the ratio, i very well understand incentre formula derivation but here i am stuck. Anybody plz?