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![Machu Picchu, Geometry Theorems and Problems, Online Education](../machu_picchu_h1_910x120.jpg)
Perpendicular Lines, Theorems
and Problems - Table of Content (18)
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![Perpendicular Lines Index](perpendicular_lines_index_1.jpg) |
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![Elearn 204](http://gogeometry.com/
problem/p204_right_triangle_circle_.jpg) |
Proposed Problem 204. Right Triangle, Incircle, Excircles, Inradius,
Exradii, Perpendicular lines. |
![Problem 203](http://gogeometry.com/
problem/p203_right_triangle_circle_.jpg) |
Proposed Problem 203. Right Triangle, Excircles, Exradii,
Hypotenuse, Perpendicular lines. |
![Problem 202 Right triangle, excircles](http://gogeometry.com/
problem/p202_right_triangle_circle_.jpg) |
Proposed Problem 202. Right Triangle, Incicrle, Excircles relatives
to catheti, Points of Tangency, Exradius, Semiperimeter, Perpendicular
lines. |
![Elearn 201](../problem/p201_right_triangle_17.jpg) |
Proposed Problem 201.
Right Triangle, Excircles, Points of Tangency, Exradius, Semiperimeter,
Perpendicular lines. |
![Elearning 200: Right Triangle](../problem/p200_right_triangle_17.jpg) |
Proposed Problem 200. Right Triangle, Incircle, Excircles, Points of
Tangency, Inradius, Perpendicular lines. |
![Archimedes Arbelos and Square](http://gogeometry.com/
geometry/arbelos_circle_square_2_17.jpg) |
Archimedes Arbelos and Square 2.
Dynamic Geometry Software.
Step-by-Step construction, Manipulation, and animation,
Perpendicular lines. |
![Archimedes Arbelos and Square](http://gogeometry.com/
geometry/arbelos_circle_square_17.jpg) |
Archimedes Arbelos and Square 1.
Dynamic Geometry Software.
Step-by-Step construction, Manipulation, and animation,
Perpendicular lines. |
![Rhombus, Square, Angle](../problem/p179_rhombus_square_17.jpg) |
Proposed Problem 179. Rhombus,
Square, Diagonal, Angle,
Perpendicular lines, Parallel lines.
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![Geometry Problem 137](../problem/p137_orthic_triangle_17.jpg) |
Proposed Problem 137.
Orthic Triangle, Altitudes, Perpendicular, Incircle, Collinear Points,
Parallelogram,
Perpendicular lines. |
![Geometry Problem 136](../problem/p136_orthic_triangle_17.jpg) |
Proposed Problem 136. Orthic
Triangle, Altitudes, Perpendicular lines, Concyclic Points. |
![Geometry Problem 135](../problem/p135_orthic_triangle_17.jpg) |
Proposed Problem 135. Orthic
Triangle, Altitudes, Perpendicular,
Perpendicular lines. |
![Bottema Theorem. Elearning.](bottema_theorem_elearning.jpg) |
Bottema's Theorem:
Triangle and Squares with Interactive Geometry Software
Step-by-Step construction, Manipulation, and animation.
Perpendicular lines. |
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