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Welcome to Centroid of a triangle, Plane Geometry Index. Site created
and maintained by Antonio Gutierrez.
Activate Flash plug-in or JavaScript and reload to view the Equilateral
triangle Index,
Online Learning.
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Centroid of a triangle,
Theorems and Problems - Table of Content
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Euclid's
Elements Book I, 23 Definitions. One-page visual illustration.
Euclid's
Elements Book. Index |
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Triangle Centers. |
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Proposed
Problem 402.
Hexagon, Triangle, Centroid, Parallel, Congruence, Similarity. |
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Proposed Problem
161.
Parallelogram, Midpoints, Octagon, Areas, Centroid.
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Nine-Point Center,
Nine-Point Circle, Euler Line (English version).
Interactive illustration.
Centroid, Orthocenter, Circumcenter.
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Puzzle: Euler Line and Nine Point Center
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Schiffler Point: Four Euler Lines with interactive animation and
manipulation.
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Proposed Problem
255.
Triangle, Centroid, Vertices, a Point, Distances, Squares.
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Proposed Problem
254.
Triangle, Centroid, Vertices, a Point, Distances, Squares.
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Proposed Problem
253.
Triangle, Centroid, Vertices, Distances, Squares.
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Proposed Problem
249.
Triangle sides, medians, squares.
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Proposed Problem
248.
Napoleon's Theorem III. Inner and outer Napoleon triangles, Area.
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Proposed Problem
247.
Napoleon's Theorem II. Internal Equilateral triangles. Inner Napoleon
triangle.
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Proposed Problem
246.
Napoleon's Theorem I. External Equilateral triangles. |
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Proposed Problem
229. Triangle, Centroid, Transversal, Perpendicular lines. |
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Proposed Problem
227. Triangle, Centroid, Exterior line, Perpendicular lines. |
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Proposed Problem
226. Triangle, Centroid, Perpendicular lines. |
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Journey to the Center of a Triangle (1976).
Incenter, Circumcenter, Centroid, Orthocenter. |
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Eight-Point Circle Theorem
centroid or gravity center of quadrilateral.
Step-by-Step construction, Manipulation, and animation. |
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Triangle, Medians, Six Circumcenters Concyclic.
Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition. |
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Proposed Problem
127. Centroid and Incenter of a Triangle,
Parallel, Proportions.
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Spieker Center Medial triangle, Centroid, Incircle |
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Heron's Formula
with medians |
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Symmedian (Lemoine) Point
Triangle Center |
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Geometry Online
Glossary .
Geometry Glossary based on the new New York State
mathematics standards initiative. |
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Right Triangle:
Centroid. Centers, Inradius, Circumradius, Incenter, Circumcenter, Orthocenter, Centroid, Poncelet's theorem, Sagitta |
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Proposed Problem
98. Quadrilateral Area, Centroid,
Similarity. |
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