Triangles: Theorems and Problems 2
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![Triangles](../geometry/triangles_index_17.jpg) |
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![Second Fermat Point](../center/fermat-point-second-dynamic-triangle-equilateral-1.jpg) |
Second Fermat Point: Static diagram.
Second Fermat Point: Dynamic diagram.
Triangle, Equilateral triangles, Concurrent lines, GeoGebra, HTML5 Animation for Tablets (iPad, Nexus) |
![Triangle with Double Angle](../geometry/double_angle_i.jpg)
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Triangle with Double Angle, Theorems and Problems, Index
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![Napoleon Theorem and Problem Index](../geometry/napoleon_theorem_index_17.jpg) |
Napoleon's theorems and problems, Index. |
![The Simson Line Index](../geometry/simson_line_i.jpg) |
The Simson Line,
Theorems and Problems - Index. |
![Triangle Geometry, New York, Slideshow](../geometry/triangle_geometry_new_york.jpg) |
Triangle Geometry in the Real World, New York - Slideshow. |
![Kosnita theorem](../center/kosnita_theorem_17.jpg) |
Kosnita's
Theorem.
Circumcenters, Concurrent lines. |
![Routh's theorem index](../geometry/routh's_theorem_index_17.jpg) |
Routh's Theorem - Index
Triangle, Cevians, Area, Ratio.
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![Marion Walter's theorem and related topics](../geometry/marion_walter_theorem_index.jpg) |
Marion Walter's Theorem
and Related Topics: Index |
![Routh's Theorem 1](../geometry/routh's_theorem_1_17.jpg) |
Routh's Theorem 1.
Triangle, Cevians, Ratio of Areas. |
![Routh's theorem: Triangle, Cevians, Area Ratio](../geometry/routh's_theorem_2_17.jpg) |
Routh's Theorem 2.
Triangle, Cevians, Ratio of Areas. |
![ROuth's Theorem 3: Triangle, Cevians, Ratio Area](../geometry/routh's_theorem_3_17.jpg) |
Routh's Theorem 3.
Triangle, Cevians, Ratio of Areas. |
![Routh's theorem 4: Triangle, Cevians, Area](../geometry/routh's_theorem_4_17.jpg) |
Routh's Theorem 4.
Triangle, Cevians, Ratio of Areas. |
![Euclid's Elements Book I,1 Proposition 7](../geometry/euclid_book_i_7_congruence.jpg) |
Euclid's Elements Book I, Proposition
7
Given two straight lines constructed on a straight line (from its extremities) and meeting in a point,... |
![Euclid's Elements Book i,1 Proposition 8 SSS](../geometry/euclid_book_i_8_sss_1.jpg) |
Euclid's Elements Book I, Proposition
8: (Side-Side-Side SSS Congruence) |
![Euclid's Elements Book I,1 Proposition 5, Isosceles Triangle](../geometry/euclid_book_i_5_isosceles_1.jpg) |
Euclid's Elements Book I, Proposition 5: (Pons Asinorum) Isosceles triangles |
![Euclid's Elements Book I Proposition 6](../geometry/euclid_book_i_6_triangle_1.jpg) |
Euclid's Elements Book I, Proposition
6: Converse of I.5 |
![a](../geometry/euclid_book_i_4_sas_17.jpg) |
Euclid's Elements Book I, Proposition 4: (Side-Angle-Side SAS) |
![Euclid's Elements Book I, Proposition 3](../geometry/euclid_book_i_3_17.jpg) |
Euclid's Elements Book I, Proposition 3: Given two unequal straight lines, to cut off from the greater a straight line equal to the less |
![Euclid's Elements Book I, Proposition 2](../geometry/euclid_book_i_2_17.jpg) |
Euclid's Elements Book I, Proposition 2: To place at a given point (as an extremity) a straight line equal to a given straight line |
![Euclid's Elements Book I, Proposition 1](../geometry/euclid_book_i_1_17.jpg) |
Euclid's Elements Book I, Proposition 1:
On a given finite line to construct an equilateral triangle |
![Carnot's Theorem, Acute Triangle](../geometry/carnot_acute_1.jpg) |
Carnot's
Theorem in an Acute Triangle. |
![Carnot's Theorem, Obtuse Triangle](../geometry/carnot_obtuse_triangle_1.jpg) |
Carnot's
Theorem in an Obtuse Triangle. |
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Geoboard
for iPad Pythagorean Theorem Proof by Leonardo. |
![iPadd Apps Geoboard, triangle with two squares](../geoboard/ipad-geoboard-496-triangle-squares-1.jpg) |
Geoboard
for iPad Gallery: Triangle with two squares (Problem 496). |
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Geoboard
for iPad Gallery: Six squares with a common vertex. |
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iPad Apps, Geometry Designer Illustration. Circle of van Lamoen.
Interactive Geometry Software for iPad, iPhone, iPod. |