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I'm thinking you stole my idea because I did the same thing on a thread of 3 kissing circles with bobbym.
Keep this comment up; I'm linking it to the GeoGebra Forum.
Did you steal my idea?
Certainly. Geometry and I have a long and happy relationship.
OK. Another diagram below.
WOW! Thats a great proof
If the radii of each of the outer circles is r then show that radius of the inner circle is