Squares, Theorems and Problems

Online Geometry: Triangles, Theorems and Problems

Triangles Theorems and Problems- Table of Content

Go Geometry Education Index

Euclid's Elements 23 definitions

Euclid's Elements Book I, 23 Definitions.
One-page visual illustration.
Triangles: Equilateral, Isosceles, Scalene.

Triangles and Lissajous Art

Triangle definition

Triangle definition

Wordflex Point

Meanings and syntactic of 'TRIANGLE'.
Created using Wordflex Touch Dictionary for iPad in association with Oxford University Press.

Point, Theorems and Problems, Index

Points, Theorems and Problems - Index.
non-collinear points. Triangle vertices.

Equilateral triangles

Equilateral Triangles Index.

Isosceles Triangle Index

Isosceles Triangle.

Isosceles triangle 80-20-80

Isosceles Triangle 80-20-80. Index.

Classical Pythagorean Theorem

Right Triangle.

Special right triangle 30 60

Special Right Triangles.

Special Right Triangle 30-60 Index

Special Right Triangle 30-60.

Obtuse Triangle Index

Obtuse Triangle.

Altitude of a triangle

Altitude Index.
Theorems and Problems.

Art: Orthocenter and Delaunay

Geometric Art: Orthocenter of a Triangle, Delaunay Triangulation.

Dynamic Geometry: Internal Feuerbach Point. HTML5 Animation for Tablets iPad, Nexus

GeoGebra, Dynamic Geometry: Internal Feuerbach Point
HTML5 Animation for Tablets (iPad, Nexus..)

Dynamic Geometry: Nine Point Circle. HTML5 Animation for Tablets (iPad, Nexus..)

GeoGebra, Dynamic Geometry: Nine Point Circle
HTML5 Animation for Tablets (iPad, Nexus..)

fractBG Triangle

iPad Apps: fractBG, Triangle.
Fractal Image with Triangles.

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

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

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

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

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

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

Dynamic Geometry: Incenter and Incircle of a Triangle. HTML5 Animation for Tablets (iPad, Nexus..)

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

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

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

Dynamic Geometry: Circumcenter and Circumcircle of a Triangle. HTML5 Animation for Tablets (iPad, Nexus..)

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

Isogonal Lines

Isogonal Lines.
Theorems and Problems.

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

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

Semiperimeter, Perimeter Index

Semiperimeter, Perimeter Index.
Theorems and Problems.

Congruence

Congruence. Index.

Similarity

Similarity, Ratios, Proportions. Index.

Areas

Areas Index

Classical Theorems

Classical Theorems of Triangles.

Triangle Centers Index.

Incenter, Incircle, Index

Incenter of a triangle. Index.

Excenter, Excircle, Index

Excenter. Index.
Excircle, Exradius.

Centroid of a triangle Index

Centroid /Barycenter of a triangle. Index.

Circumcenter Index

Circumcenter of a triangle. Index.

Orthocenter Index

Orthocenter of a triangle. Index.

Circumcircle Index

Circumcircle Index.

Orthic Triangle Index

Orthic Triangle Index.

van Lamoen Circle Index

van Lamoen Circle - Index.

Exeter Point

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

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Last updated: Sep 10, 2015