Perpendicular Lines, Theorems
and Problems - Table of Content (20)
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![Perpendicular Lines Index](perpendicular_lines_index_1.jpg) |
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![](../problem/p062_square_diagonal_17.jpg) |
Proposed Problem 62: Square
Diagonal, Inscribed Circle,
Perpendicular lines, Parallel lines. |
![](sangaku_cyclic_quad_170_2.jpg) |
Sangaku
Geometry Theorem: Cyclic Quadrilateral.
Inradii, Rectangle, Perpendicular lines, Parallel lines. |
![Hinged tessellation, Dynamic geometry](../javacar/hinged_tessellation_170.jpg) |
Interactive Hinged tessellation. Square tessellation - Dynamic Geometry.
Please be patient while the applet loads on your computer. This Java
applet requires Java 1.3 or higher.
Perpendicular lines, Parallel lines. |
![](../triangle_square/triangle_square_22_170.jpg) |
Triangle and Squares 22
Perpendicular lines, Parallel lines. |
![](../triangle_square/triangle_square_20_170.jpg) |
Triangle and Squares
20
Perpendicular lines, Parallel lines. |
![](../problem/p049_right_triangle_170.jpg) |
Proposed Problem 49.
Angles and right triangle, Perpendicular
lines.
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![](../triangle_square/triangle_square_17_170.jpg) |
Triangle and Squares
17, Perpendicular lines.
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![](../problem/p039_angle_170.jpg) |
Problem 39.
Triangle, Incircle, Bisector, Cyclic Quadrilateral and angles,
Perpendicular lines. |
![](../problem/p029_problem_proof_170.jpg) |
Proposed Problem 29.
Right Triangle, altitude, incircle and inradius,
Perpendicular lines. Ten conclusions. |
![](../problem/p027_right_triangle_inc170.jpg) |
Proposed Problem 27
Right Triangle, incircles and inradius,
Perpendicular lines. |
![](../triangle_square/eyeball_theorem_170.jpg) |
Eyeball Theorem:
Animated Angle to Geometry Study.
Perpendicular lines, Parallel lines. |
![](../problem/p020_right_triangle_inc170.jpg) |
Proposed problem
20
Right Triangle, Perpendicular lines,
Parallel lines, incircles and
inradii. |
![](../parallelogramsquare170x100.jpg) |
Parallelogram with Squares theorem Thébault's Theorem.
Perpendicular lines |
![](../Kurschak170x100.jpg) |
Kurschak's Tile and Theorem.
Jozsef Kurschak (Hungary, 1864-1933) An elegant and a purely geometric
way of finding the area of a regular dodecagon.
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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 |
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