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Triangles Theorems and Problems-
Table of Content
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Euclid's Elements
Book I, 23 Definitions.
One-page visual illustration.
Triangles: Equilateral, Isosceles, Scalene. |
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Triangles
and Lissajous Art |
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Triangle definition
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Meanings and syntactic of 'TRIANGLE'.
Created using Wordflex Touch Dictionary for iPad in association with Oxford University Press. |
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Points, Theorems and Problems - Index.
non-collinear points. Triangle vertices. |
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Equilateral Triangles Index. |
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Isosceles Triangle. |
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Isosceles Triangle
80-20-80. Index. |
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Right Triangle. |
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Special Right Triangles.
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Special Right Triangle
30-60.
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Obtuse Triangle. |
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Altitude Index.
Theorems and Problems. |
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GeoGebra, Dynamic Geometry:
Internal Feuerbach Point
HTML5 Animation for Tablets (iPad, Nexus..) |
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GeoGebra, Dynamic Geometry:
Nine Point Circle
HTML5 Animation for Tablets (iPad, Nexus..) |
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GeoGebra, Dynamic Geometry:
Lemoine Line
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) |
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GeoGebra, Dynamic Geometry:
Simson Line
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) |
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GeoGebra, Dynamic Geometry:
Euler Line
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) |
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GeoGebra, Dynamic Geometry: Incenter and Incircle
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) |
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GeoGebra, Dynamic Geometry:
Centroid
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) |
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GeoGebra, Dynamic Geometry: Circumcenter and Circumcircle
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) |
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Isogonal Lines.
Theorems and Problems. |
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GeoGebra, Dynamic Geometry:
Orthocenter
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) |
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Semiperimeter, Perimeter Index.
Theorems and Problems. |
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Congruence.
Index.
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Similarity, Ratios, Proportions.
Index.
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Areas Index |
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Classical Theorems
of Triangles.
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Triangle Centers Index. |
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Incenter of a triangle.
Index.
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Excenter.
Index.
Excircle, Exradius.
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Centroid
/Barycenter of a triangle.
Index.
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Circumcenter of a triangle.
Index.
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Orthocenter of a triangle.
Index.
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Circumcircle
Index.
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Orthic Triangle
Index.
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van Lamoen Circle - Index. |
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Triangle Incenter by Folding,
Video.
Dynamic Geometry Software:
Tabula by Numeracy Works.
Step-by-Step construction, Manipulation, and animation. |
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Triangle with Double Angle, Theorems and Problems, Index
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Triangle
Orthocenter by Folding,
Video.
Dynamic Geometry Software:
Tabula by Numeracy Works.
Step-by-Step construction, Manipulation, and animation. |
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Triangle
Centroid by Folding,
Video.
Dynamic Geometry Software:
Tabula by Numeracy Works.
Step-by-Step construction, Manipulation, and animation. |
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Triangle
Circumcenter by Folding,
Video.
Dynamic Geometry Software:
Tabula by Numeracy Works.
Step-by-Step construction, Manipulation, and animation. |
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Napoleon's theorems and problems, Index. |
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The Simson Line,
Theorems and Problems - Index. |
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Triangle Geometry in the Real World, New York - Slideshow. |
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Engineering the Impossible: Chartres Cathedral
Circle, Square, Triangle. |
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Kosnita's
Theorem.
Circumcenters, Concurrent lines. |
