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Four Disks (Posted on 2005-02-02) Difficulty: 2 of 5
Four disks are arranged in a plane such that each is externally tangent to two others. Prove that the four points of tangency lie on a circle.

See The Solution Submitted by David Shin    
Rating: 3.0000 (4 votes)

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re(2): Initial Thoughts | Comment 4 of 5 |
(In reply to re: Initial Thoughts by Hugo)

"But Jer's work is more elegant then ours :(  "

It was a  :) for me!

Nice problem

  Posted by Jer on 2005-02-02 20:12:21
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