What is the name of the circle that is tangent to three mutually-tangent circles centered at the vertices of a triangle?

Question

I want some information about the little 'tangent circle', but I don't have its name to search for it in the internet. What is it called?

score 21 · Accepted Answer · answered Jul 15 '16 at 10:02

21

I think that's the Inner Soddy Circle.

answered Jul 15 '16 at 10:02

dahemar

score 14 · Answer 2 · answered Jul 15 '16 at 10:03

14

I think that (inner) Soddy circle is what you want.

answered Jul 15 '16 at 10:03

mathlove

2 Answers2