Feuerbach's Theorem/Historical Note
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Historical Note on Feuerbach's Theorem
Feuerbach's Theorem was proved in $1822$ by Karl Wilhelm Feuerbach.
This was two years after Jean-Victor Poncelet and Charles Julien Brianchon had demonstrated the existence of the nine point circle, now known as the Feuerbach circle.
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $9$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $9$