000RM.dvi

25.3 Ceva Theorem 705

Example: incenter

IfAX,BY,CZare the angle bisectors, the intersection is the incenter
I:

c b

a

c

b

a

A

B C

I

Z

X

Y

X =(0:b:c)

Y =(a:0:c)

Z =(a:b:0)

I =(a:b:c)