Geometry Triangles, Theorems and Problems
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![Go Geometry Education Index](education/geometry_education_17.jpg) |
Triangle
Problems |
![Euclid's Elements 23 definitions](geometry/euclid_elements_definition_170.jpg) |
Euclid's Elements
Book I, 23 Definitions.
One-page visual illustration.
Triangles: Equilateral, Isosceles, Scalene. |
![](geometric_art/geometry_art_lissajous_170.jpg) |
Triangles
and Lissajous Art |
![Triangle definition](math_geometry_online_courses/triangle-definition-1.jpg) |
Triangle definition
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![Wordflex Point](ipad/wordflex/wordflex-ipad-triangle-semantic-syntactic-tree-geometry-1.jpg) |
Meanings and syntactic of 'TRIANGLE'.
Created using Wordflex Touch Dictionary for iPad in association with Oxford University Press. |
![Point, Theorems and Problems, Index](geometry/point_theorems_index_17.jpg) |
Points, Theorems and Problems - Index.
non-collinear points. Triangle vertices. |
![Equilateral triangles](geometry/equilateral_triangle_17_ind.jpg) |
Equilateral Triangles Index. |
![Isosceles Triangle Index](geometry/isosceles_triangle_index_17.jpg) |
Isosceles Triangle. |
![Isosceles triangle 80-20-80](geometry/isosceles_80_20_80_index.jpg) |
Isosceles Triangle
80-20-80. Index. |
![Classical Pythagorean Theorem](pythagoras/pythagoras_theorem_17.jpg) |
Right Triangle. |
![Special right triangle 30 60](geometry/special_right_triangle_17.jpg) |
Special Right Triangles.
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![Special Right Triangle 30-60 Index](geometry/right_triangle_30_60_17.jpg) |
Special Right Triangle
30-60.
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![Obtuse Triangle Index](geometry/obtuse_triangle_index_17.jpg) |
Obtuse Triangle. |
![Altitude of a triangle](geometry/altitude_triangle_17.jpg) |
Altitude Index.
Theorems and Problems. |
![Art: Orthocenter and Delaunay](software/sketch/orthocenter-triangle-art-delaunay-1.jpg) |
Geometric Art: Orthocenter of a Triangle, Delaunay Triangulation. |
![Dynamic Geometry: Internal Feuerbach Point. HTML5 Animation for Tablets iPad, Nexus](geogebra/internal-feuerbach-point-html5-animation-tablet-ipad-nexus-1.jpg) |
GeoGebra, Dynamic Geometry:
Internal Feuerbach Point
HTML5 Animation for Tablets (iPad, Nexus..) |
![Dynamic Geometry: Nine Point Circle. HTML5 Animation for Tablets (iPad, Nexus..)](geogebra/nine-point-circle-euler-feuerbach-html5-animation-ipad-nexus-1.jpg) |
GeoGebra, Dynamic Geometry:
Nine Point Circle
HTML5 Animation for Tablets (iPad, Nexus..) |
![fractBG Triangle](ipad/fractbg/ipad-apps-fractal-fractbg-triangle-01-1.jpg) |
iPad Apps:
fractBG, Triangle.
Fractal Image with Triangles. |
![Dynamic Geometry: Lemoine Line of a Triangle. HTML5 Animation for Tablets (iPad, Nexus..)](geogebra/lemoine-line-triangle-html5-animation-ipad-nexus-1.jpg) |
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/simson-line-triangle-line-html5-animation-ipad-nexus-1.jpg) |
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/geogebra-triangle-euler-line-html5-animation-ipad-nexus-1.jpg) |
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..)](center/incenter-incircle-geogebra-html5-animation-tablet-mobile-ipad-nexus-1.jpg) |
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/geogebra-triangle-centroid-median-html5-animation-ipad-nexus-1.jpg) |
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/geogebra-triangle-circumcenter-circumcircle-html5-animation-ipad-nexus-1.jpg) |
GeoGebra, Dynamic Geometry: Circumcenter and Circumcircle
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) |
![Isogonal Lines](math_geometry_online_courses/isogonal-lines-conjugate-theorems-problems-index-1.jpg) |
Isogonal Lines.
Theorems and Problems. |
![Dynamic Geometry: Orthocenter of a Triangle. HTML5 Animation for Tablets (iPad, Nexus..)](geogebra/geogebra-triangle-orthocenter-html5-animation-ipad-nexus-1.jpg) |
GeoGebra, Dynamic Geometry:
Orthocenter
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) |
![Semiperimeter, Perimeter Index](geometry/semiperimeter_index_1.jpg) |
Semiperimeter, Perimeter Index.
Theorems and Problems. |
![Congruence](geometry/congruence_geometry_17.jpg) |
Congruence.
Index.
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![Similarity](geometry/similarity_ratio_index_17.jpg) |
Similarity, Ratios, Proportions.
Index.
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![Areas](geometry/areas_measurement_17.jpg) |
Areas Index |
![Classical Theorems](geometry/classical_theorems_17.jpg) |
Classical Theorems
of Triangles.
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![](triangle_center_170.jpg) |
Triangle Centers Index. |
![Incenter, Incircle, Index](center/incenter_incircle_17.jpg) |
Incenter of a triangle.
Index.
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![Excenter, Excircle, Index](center/excenter_excircle_17.jpg) |
Excenter.
Index.
Excircle, Exradius.
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![Centroid of a triangle Index](center/centroid_barycenter_index.jpg) |
Centroid
/Barycenter of a triangle.
Index.
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![Circumcenter Index](center/circumcenter_index_17.jpg) |
Circumcenter of a triangle.
Index.
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![Orthocenter Index](center/orthocenter_altitude_index.jpg) |
Orthocenter of a triangle.
Index.
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![Circumcircle Index](center/circumcircle_index_1.jpg) |
Circumcircle
Index.
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![Orthic Triangle Index](geometry/orthic_triangle_index_1.jpg) |
Orthic Triangle
Index.
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![van Lamoen Circle Index](geometry/triangle-centroid-six-circumcenters-van-lamoen-circle-index-1.jpg) |
van Lamoen Circle - Index. |
![Exeter Point](center/exeter-point-triangle-centroid-circumcircle-concurrency-euler-html5-1.jpg) |
Dynamic Geometry: Exeter Point Triangle, Median, Circumcircle, Concurrent Lines, Euler Line, GeoGebra, HTML5 Animation for Tablets.
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