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Connections
triangle
Entity
square
Entity
Nîmes
Entity
plane
Entity
Euclidean geometry
Entity
Euler line
Entity
nine-point circle
Entity
MathWorld
Entity
Eric W. Weisstein
Entity
triangle center
Entity
Joseph Diez Gergonne
Entity
isogonal conjugate
Entity
Encyclopedia of Triangle Centers
Entity
Clark Kimberling
Entity
nine-point center
Entity
Napoleon points
Entity