

Centroid or Barycenter of a triangle, Online Geometry,
Theorems and Problems

Centroid of a triangle, Index




Euclid's Elements Book I, 23 Definitions
Onepage visual illustration.
Euclid's
Elements Book. Index 

Triangle
Centroid by Folding,
Video.
Dynamic Geometry Software:
Tabula by Numeracy Works.
StepbyStep construction, Manipulation, and animation. 

GeoGebra, Dynamic Geometry:
Centroid
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) 

GeoGebra, Dynamic Geometry:
Euler Line
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) 

Triangle Centers. 

Distances between Triangle Centers
Index.


Geometry Problem
1007.
Hexagon, Midpoint, Triangle, Median, Centroid, Concurrency. 

Geometry Problem 847
van Lamoen Circle, Triangle, Medians, Centroid, Six Circumcenters, Concyclic Points. 

Geometry Problem 846
Triangle, Medians, Centroid, Four Circumcenters, Concyclic Points, Cyclic Quadrilateral, Similarity. 

Geometry Problem 845
Triangle, Medians, Centroid, Four Circumcenters, Perpendicular, Congruence, Similarity. 

Geometry Problem 844
Triangle, Medians, Centroid, Four Circumcenters, Perpendicular, Congruence, Similarity. 

Geometry Problem 843
Triangle, Medians, Centroid, Four Circumcenters, Perpendicular, Parallel, Congruence, Similarity. 

Geometry Problem 842
Triangle, Medians, Centroid, Four Circumcenters, Perpendicular, Congruence, Similarity. 

Geometry Problem 841
Triangle, Medians, Centroid, Circumcenters, Perpendicular, Congruence, Similarity. 

Geometry Problem
742.
Scalene Triangle, Orthocenter, Centroid, Circumcenter, Circumradius, Midpoint, Distance, Square, Metric Relations. 

Problem
576.
Centroid, Triangle, Quadrilateral, Parallel, Measurement. 

Proposed Problem 402.
Hexagon, Triangle, Centroid, Parallel, Congruence, Similarity. 

Proposed Problem 161.
Parallelogram, Midpoints, Octagon, Areas, Centroid.


NinePoint Center, NinePoint Circle, Euler Line (English
version).
Interactive illustration.
Centroid, Orthocenter, Circumcenter.


Puzzle: Euler Line and Nine Point Center


Schiffler Point: Four Euler Lines with interactive animation and
manipulation.


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


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


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


Proposed Problem 249.
Triangle sides, medians, squares.


Proposed Problem 248.
Napoleon's Theorem III. Inner and outer Napoleon triangles, Area.


Proposed Problem 247.
Napoleon's Theorem II. Internal Equilateral triangles. Inner Napoleon
triangle.


Proposed Problem 246.
Napoleon's Theorem I. External Equilateral triangles. 

Proposed Problem 229. Triangle, Centroid, Transversal, Perpendicular
lines. 

Proposed Problem 227. Triangle, Centroid, Exterior line,
Perpendicular lines. 

Proposed Problem 226. Triangle, Centroid, Perpendicular lines.


Journey
to the Center of a Triangle (1976). Incenter, Circumcenter,
Centroid, Orthocenter. 

EightPoint Circle Theorem
centroid or gravity center of quadrilateral.
StepbyStep construction, Manipulation, and animation. 

Triangle, Medians, Six Circumcenters Concyclic.
Dynamic Geometry.
StepbyStep construction, Manipulation, and animation.
Prove proposition. 

Proposed Problem 127. Centroid
and Incenter of a Triangle, Parallel, Proportions.


Spieker Center Medial
triangle, Centroid, Incircle 

Heron's Formula with medians 

Symmedian (Lemoine) Point
Triangle Center 

Geometry Online Glossary .
Geometry Glossary based on the new New York State
mathematics standards initiative. 

Right Triangle: Centroid. Centers, Inradius, Circumradius, Incenter,
Circumcenter, Orthocenter, Centroid, Poncelet's theorem, Sagitta 

Proposed Problem 98.
Quadrilateral Area, Centroid, Similarity. 








