Feuerbach point
Feuerbach point
Point where the incircle and nine-point circle of a triangle are tangent.
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Casey's theorem
On four non-intersecting circles that lie inside a bigger circle and tangent to it.
19%
Incircle and excircles
Circles tangent to all three sides of a triangle.
18%
Triangle center
Point in a triangle that can be seen as its middle under some criteria.
12%
Karl Wilhelm Feuerbach
German mathematician (1800–1834).
11%
Nine-point circle
Circle constructed from a triangle.
11%