Definition:Feuerbach Circle/Historical Note
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Historical Note on Feuerbach Circle
Although named after Karl Wilhelm Feuerbach, the Feuerbach Circle was actually discovered in $1820$ by Jean-Victor Poncelet and Charles Julien Brianchon.
It bears Feuerbach's name as the result of Feuerbach's Theorem, which extends the known properties of the circle to include the tangencies to the incircle and excircles.
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $9$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $9$