26.2 A relation among the radii 713
26.2 A relation among the radii ...........
ra+rb+rc=4R+r.
ra
r
rc
rb
D
I
A
B C
Ic
Ia
Ib
O
M
M′
ra−r=2DM′,
rb+rc=2MD=2(2R−DM′);
ra+rb+rc−r=4R.
26.2 A relation among the radii 713
ra+rb+rc=4R+r.
ra
r
rc
rb
D
I
A
B C
Ic
Ia
Ib
O
M
M′
ra−r=2DM′,
rb+rc=2MD=2(2R−DM′);
ra+rb+rc−r=4R.