
Concurrent Lines  Table of Content
 Page 5




IsogonicJacobi
Theorem: Using TracenPoche Dynamic
Geometry Software.
Concurrent lines. 

Marion
Walter's Theorem: Triangle and Hexagon areas:
Using TracenPoche Dynamic Geometry Software. Concurrent Lines? 

NinePoint Center, NinePoint Circle, Euler Line.
Interactive illustration.
Concurrent altitudes, median, perpendicular bisectors.


Seven Circles Theorem
Concurrent lines of tangency points. 

Proposed Problem 79: Triangle.
Similarity, Concurrent Altitudes, Orthocenter, Incircles, Inradii. 

Triangle and Squares 22
Concurrent altitudes. 

Proposed Problem
51: Fagnano's Problem
Inscribed Triangle with the Minimum Perimeter.
Concurrent altitudes.


Spieker Center
Concurrent lines. 

Second AjimaMalfatti Point
Interactive illustration. Concurrent lines. 

First AjimaMalfatti Point
Animated illustration. Concurrent lines. 

Triangle and Squares
17
Concurrent lines. 

Triangle and Squares
16
Concurrent lines. 

Blanchet Theorem
Concurrent lines.


Steiner Point


Mittenpunkt Point


Proposed
problem 21
Acute triangle, orthocenter, diameter, tangents. Concurrent altitudes. 
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