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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 (15)
|
![Perpendicular Lines Index](perpendicular_lines_index_1.jpg) |
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![](../ArchBooLem12_170.jpg) |
Proposition 12
Semicircle, Perpendicular to diameter, Chords, Tangents. |
![](../ArchBooLem13_170.jpg) |
Proposition 13
Circle, Diameter, Perpendicular to chords, Congruence. |
![](../ArchBooLem14_170.jpg) |
Proposition 14
Salinon: Semicircles, Perpendicular to diameter, Circles,
Areas. |
![](../ArchBooLem15_170.jpg) |
Proposition 15
Circle, Perpendicular to diameter, Inscribed Regular Pentagon, Arc,
Midpoint, Radius. |
![Euclid Elements Book X, Lemma for Proposition 33](euclid_book_x_33_17.jpg) |
Euclid's
Elements, Book X, Lemma for Proposition 33
One page visual illustration.
Perpendicular to a side, Parallel lines. |
![Tangent Circles, Radius](../problem/p290_tangent_circles_17.jpg) |
Proposed Problem 290.
Internally Tangent circles, Radius, Perpendicular lines, Tangent. |
![Geometry Expressions](geometry_expressions_01a17.jpg) |
Geometry Expressions.
Perpendicular lines |
![Tangent Circles](../problem/p289_tangent_circles_17.jpg) |
Proposed Problem 289: Tangent circles, Radius, Perpendicular, Tangent. |
![Chartres Cathedral](../wonder_world/chartres_cathedral_17.jpg) |
Engineering the Impossible: Chartres Cathedral
Circle, Square, Triangle,
Perpendicular lines. |
![Quadrilateral, Perpendicular, Squares, Area](../problem/p280_quadrilateral_squares_.jpg) |
Proposed Problem 280.
Quadrilateral, Perpendicular lines, , Parallel lines, Area of Squares. |
![Piet Mondrain, New York City](../wonder_world/piet_mondrian_new_york_17.jpg) |
Piet Mondrian, New York City 1941-42 and the Golden Rectangle.
Index.
Perpendicular lines. |
![Piet Mondrian, Lozenge](../wonder_world/piet_mondrian_lozenge_17.jpg) |
Piet Mondrian, Lozenge Composition with Red, Black, Blue, and Yellow
1925,
Pioneer of Geometric abstraction.
Perpendicular lines. |
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