Obtuse Triangle Theorems and
Problems - Table of Content
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![Obtuse Triangle Index](obtuse_triangle_index_17.jpg) |
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![Euclid's Elements 23 definitions](euclid_elements_definition_170.jpg) |
Euclid's Elements
Book I, 23 Definitions. One-page visual illustration.
Euclid's Elements Book.
Index |
![Euclid's Elements, Book II, Proposition 12](euclid_elements_ii_12_17.jpg) |
Euclid's Elements Book II, Proposition 12: Law of Cosines.
Obtuse triangle. |
![](../center/feuerbach_theorem_obtuse_17.jpg) |
Feuerbach Theorem, Obtuse Triangle illustration.
Obtuse triangle. |
![Pythagoras curiosity. Online tutoring.](../pythagoras/pythagoras_curiosity_17.jpg) |
The Pythagorean Curiosity
Triangles and squares, fifteen conclusions.
Several obtuse triangles. |
![Geometry Problem 1033](../school-college/1/p1033-triangle-obtuse-circumcircle-diameter-area-math-1.jpg) |
Geometry Problem
1033.
Triangle, Angle Obtuse, Circumcircle, Diameter, Area. |
![Triangle, 120 degrees, angle bisectors](../problem/p368_triangle_120_17.jpg) |
Proposed Problem 368.
Obtuse Triangle, 120 degrees, Angle bisectors, Perpendicular. |
![Triangle area, Circle, Curvilinear triangle](../problem/p364_triangle_area_17.jpg) |
Proposed Problem 364.
Obtuse triangle, Congruence, Circles, Diameter, Curvilinear triangle,
Area. |
![Area of a triangle](../problem/p322_triangle_area_17.jpg) |
Proposed Problem 322.
Square, Inscribed circle, Tangent, Triangle area.
Obtuse triangle. |
![Triangle and angle bisector of 120 degrees](../problem/p304_triangle_120_degree_17.jpg) |
Proposed Problem 304.
Triangle, Angle bisector of 120 degrees. Obtuse triangle. |
![Elearn 212: 120 degree triangle, area](../problem/p212_triangle_120_area_17.jpg) |
Proposed Problem 212. 120 Degree Triangle, Equilateral triangles,
Areas.
Obtuse triangle. |
![Problem: Triangle, Altitude, Angles](../problem/p199_triangle_angle_17.jpg) |
Proposed Problem 199. Triangle, Quadrilateral, Angles.
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![Area of Square and triangle, Elearning.](../problem/p112_area_triangle_elearn_17.jpg) |
Proposed Problem 112. Area of
square and obtuse triangle.
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Problem 47.
Obtuse Triangle, median, and angles. |
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Problem 46. Obtuse
Triangle, median, and angles. |
![Obtuse triangle](../problem/problem_14_17.jpg) |
Problem 14. Obtuse
Triangle, median, and angles. |
![Obtuse triangle](../problem/problem001_angle_triangle_1.jpg) |
Problem
1. Obtuse Triangle, median and angles. |