Online Geometry

Online Geometry: Triangle Centers, Theorems and Problems Index, Page 1

Triangle Centers - Table of Content

The School of Athens

Triangle centers, visual index

Triangle Centers, Visual Index.

Incenter, Incircle, Index

Incenter of a triangle. Index.

Excenter, Excircle, Index

Excenter. Index.
Excircle, Exradius.

Circumcenter Index

Circumcenter. Index.

Centroid of a triangle Index

Centroid /Barycenter. Index.

Orthocenter Index

Orthocenter Index.

Circumcircle Index

Circumcircle Index.

Nine-point-circle, Euler Line, HTML5 Animation for iPad and Nexus

Nine-Point Center, Nine-Point Circle, Euler Line. Interactive illustration.
Circumcenter, Centroid, Orthocenter
HTML5 Animation for iPad and Nexus

Adobe Flash Animation.

Gergonne Point Theorems and Problems Index

Gergonne Points Index
Triangle Center

Nagel Point Theorems and Problems Index

Nagel Points Index
Triangle Center

Lester Circle Theorem

Lester Circle Theorem.

Gergonne Point Theorem

Gergonne Point Theorem. Concurrency. Interactive proof with animation.
HTML5 Animation for Tablets (iPad, Nexus)
Adobe Flash Animation
Key concept: Ceva's Theorem.

Nagel Point Theorem. Proof.
 

Symmedian (Lemoine) Point
Triangle Center

Fermat Point

Geometry Problem 903: First Fermat Point.
Post a solution
 

Exeter Point

Puzzle: Exeter Point
Triangle, Median, Circumcircle, Concurrent Lines, Euler Line.

Exeter Point

Dynamic Geometry: Exeter Point
Triangle, Median, Circumcircle, Concurrent Lines, Euler Line, GeoGebra, HTML5 Animation for Tablets.

Second Fermat Point

Second Fermat Point: Static diagram.
Second Fermat Point: Dynamic diagram.
Triangle, Equilateral triangles, Concurrent lines, GeoGebra, HTML5 Animation for Tablets (iPad, Nexus)

Vecten Point

Outer Vecten Point.
 

Morley Triangle and Center

Morley's Triangle and Center
Triangle Center

Feuerbach Point

Feuerbach Point
Triangle Center

iPad Apps IGS Apollonius: Feuerbach Point. Triangle, Incircle, Nine point circle, Tangent circles, Orthocenter, Midpoint 

iPad Apps: Apollonius Software. Feuerbach Point. Triangle, Incircle, Nine point circle, Tangent circles, Orthocenter, Midpoint.
Interactive Geometry Software.

Schiffler Point

Schiffler Point: Euler Lines
Triangle Center

The Bevan Point
The circumcenter of the excentral triangle. Illustration with animation.

Spieker Center

Spieker Center
Triangle Center

Ajima Malfatti Point 2

Ajima-Malfatti Point 2
Triangle Center. Interactive illustration.

Ajima-Malfatti Point 1

Ajima-Malfatti Point 1
Triangle Center. Interactive illustration.

Steiner Point

Steiner Point
Triangle Center

Mittenpunkt Point

Mittenpunkt Point
Triangle Center

Kosnita theorem

Kosnita's Theorem.
Circumcenters, Concurrent lines.

Clawson Point

Clawson Point.
Orthic and Extangents Triangles, Concurrent lines.

Clawson Point Puzzle, Geometry for Kids

Clawson Point Puzzle, Geometry for Kids.
22 Piece Polygons

Adams' Circle Theorem
 

Distance between triangle centers

Distances between Triangle Centers Index.

Triangle Centers.

Napoleon Theorem I

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

Circulo de los nueve puntos, Spanish

Circulo de los Nueve Puntos: Spanish version.
Interactive illustration.

Puzzle: Euler Line and Nine Point Center

Geometry problem 1231

Geometry Problem 1231
Triangle, Orthocenter, Incenter, Circumcenter, Angle Bisector, Center, Circle.

Adams Circle

Geometry Problem 821.
Adams Circle.

Equilateral triangle, Perimeter

Geometry Problem 754.
Equilateral Triangle, Center, Angle, 60 Degrees, Perimeter.

Distance between the incenter to the centroid

Problem 690: Distance between the Incenter and the Centroid of a Triangle.
Formula in terms of the sides a,b,c.

Triangle, Excircles, Tangent, Concurrency

Geometry Problem 689.
Triangle, Three Excircles, Tangency points, Tangent lines, Concurrent Lines, Mind Map.

Triangle with squares, Circumcircles

Proposed Problem 370.
Triangle with squares, Circumcircles, Tangent circles.

Equal Incircles Theorem: Triangles, cevians, circles.

Problem 257: Equilateral triangle, circumcircle

Proposed Problem 257.
Equilateral Triangle, Circumcircle, Point, Vertices, Side, Distances, Squares.

Elearning 256: Equilateral triangle

Proposed Problem 256.
Equilateral Triangle, Circumcircle, Point, Vertices, Distances.

Problem 254: Triangle and Centroid

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

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