Connections
geometry
Entity
triangle
Entity
circle
Entity
plane
Entity
line segment
Entity
vertex
Entity
median
Entity
nine-point circle
Entity
MathWorld
Entity
altitude
Entity
centroid
Entity
Eric W. Weisstein
Entity
triangle center
Entity
orthocenter
Entity
cevian
Entity
Encyclopedia of Triangle Centers
Entity
Lester's theorem
Entity
Clark Kimberling
Entity
Parry point
Entity
circumscribed circle for triangle
Entity