perplexus.info :: Geometry : Four Disks

Four Disks (Posted on 2005-02-02)

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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