A theorem popularized by Martin Gardner in an article in The College Journal of Mathematics.
A relationship between the common tangents of two circles.
An application of the “power of a point” theorem.
On how to get the widest angle of view.
Where to stand to get the best view of the rings?
…and a nice solution by Dan Hoey.
Intriguing puzzle proposed by Steve Gray.
Maybe easy to solve… I don't know.
… and extension to tetrahedra.
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