Isosceles Triangle 80-20-80,
Theorems and Problems -
Table of Content
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![Isosceles triangle 80-20-80](isosceles_80_20_80_index.jpg) |
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![](../langley170x100.jpg) |
Langley's Problem
Adventitious angles. 20° isosceles triangle with animation.
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![Isolines of Langley's Problem](../software/isoline/langley-problem-isolines-isosceles-triangle-ipad-software-1.jpg) |
Geometric Art: Isolines or Contour Lines of Langley's Problem, Isosceles Triangle 80-20-80 Degrees, Geometry for Kids, iPad, Software |
![Geometry Problem 1508](../school-college/6/p1508-isosceles-equilateral-triangle-angles-quadrilateral-60-80-degrees-1.jpg) |
Geometry
Problem 1508.
Understanding Triangle Geometry: Isosceles, Equilateral, Quadrilateral, Angular. Difficulty Level: High School. |
![Problem 1389 40-120-20 triangle](../school-college/4/p1389-triangle-40-20-degree-angle-congruence-tutoring-1.jpg) |
Geometry Problem 1389. Triangle, 40-120-20 degree, Angle, Congruence. |
![Problem 1388 40-60-80 triangle](../school-college/4/p1388-triangle-40-60-80-degree-incenter-side-congruence-1.jpg) |
Geometry Problem 1388. Triangle 40-60-80 degree, Incenter, Congruence. |
![Geometry problem 1341](../school-college/4/p1341-isosceles-triangle-80-20-80-bisector-circumcenter-1.jpg) |
Problem 1341.
Geometry Problem 1341: Isosceles Triangle, 80-20-80 Degrees, Circumcenter, Angle Bisector.
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![Geometry problem 1274](../school-college/3/p1274-isosceles-triangle-80-20-80-measurement-1.jpg) |
Geometry Problem 1274.
Isosceles Triangle, 80-20-80 Degrees, Area, Inradius, Circumradius, Angle Bisector, Metric Relations, Measurement. |
![Geometry Problem 1038](../school-college/1/p1038-isosceles-triangle-80-20-65-degrees-online-math-1.jpg) |
Geometry Problem
1038.
Isosceles Triangle, Angle, 80, 20, 25, 65 Degrees. |
![Isosceles triangle 80, 20, 20 degrees](p691_isosceles_80_degree_1.jpg) |
Geometry Problem 691.
Isosceles Triangle, 80-80-20 Degrees, Angles, Congruence, Mind Map, Polya. |
![Geometry Problem 688, Triangle, 60 Degrees, Mind Map](../geometry/p688_triangle_60_degree_1.jpg) |
Geometry Problem 688.
Triangle, Angles, 10, 20, 30, 40, 60 Degrees, Measure, Mind Map, Polya. |
![Isosceles triangle 80 80 20](../problem/p358_triangle_80_80_20_17.jpg) |
Proposed Problem 358.
Isosceles triangle 80-80-20, Circle, Angles, Congruence. |
![Isoscele triangle 80-80-20](../problem/p274_triangle_80_20_17.jpg) |
Proposed Problem 274.
Isosceles Triangle, 80-80-20, Angles. |
![Triangle, cevian, equal segments, angles, 80-20 degrees](../problem/problem010_80_degrees_17.jpg) |
Problem
10.
Triangle, cevian, equal segments, angles, 80-20 degrees
Solution. |
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by Antonio Gutierrez
Last updated Feb 9, 2023
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