

Geometry: Concurrent Lines,
Theorems and Problems


Concurrent Lines  Table of Content
 Page 3




Proposed Problem 393.
Triangle, Orthocenter, Circumcircles, Congruence, Collinear. 

Proposed Problem 392.
Triangle, Parallel lines, Concurrent lines. 

Proposed Problem 390.
Triangle, Parallel lines, Collinear points.
Concurrent lines. 

Proposed Problem 368.
Triangle, 120 degrees, Angle bisectors, Perpendicular.
Concurrent lines. 

Proposed Problem 366.
Scalene triangle, Circumcircle, Angles, 60 Degrees, Equilateral
triangle.
Concurrent lines. 

Proposed Problem 345.
Equal circles, Tangents, Concurrent lines, Hexagon, Semiperimeter. 

Proposed Problem 324.
Quadrilateral with perpendicular diagonals, Concurrence. 

Proposed Problem 319.
Triangle, Altitudes, Perpendiculars, Collinear points.
Concurrent lines. 

Proposed Problem 318.
A Scalene triangle, Altitudes, Collinear points.
Concurrent altitudes. 

Proposed Problem 292.
Triangle, Parallel, Congruence, Similarity. 

Proposed Problem 255.
Triangle, Centroid, Vertices, a Point, Distances, Squares.
Concurrent medians.


Proposed Problem 254.
Triangle, Centroid, Vertices, a Point, Distances, Squares.
Concurrent medians.


Proposed Problem 253.
Triangle, Centroid, Vertices, Distances, Squares.
Concurrent medians.


Proposed Problem 249.
Triangle sides, medians, squares.
Concurrent medians.


Proposed Problem 191. Triangle,
Altitudes, Orthocenter, Squares, Areas.
Concurrent altitudes.


Proposed Problem 153.
Circumscribed Quadrilateral, Diagonals Concurrent with Chords.

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