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Parallel Lines, Page 5
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![Parallel Lines Index](parallel_lines_index_17.jpg) |
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![Pythagoras curiosity. Online tutoring.](../pythagoras/pythagoras_curiosity_17.jpg) |
The Pythagorean Curiosity
Triangles and squares, fifteen conclusions.
Parallel lines.
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![Triangle Square Theorem 1. Elearning, Online Tutoring](triangle_square_01_17.jpg) |
Triangle
and Squares Theorem 1: with Interactive Geometry Software
Step-by-Step construction, Manipulation, and animation.
Parallel lines. |
![Quadrilateral Area, Elearning.](../problem/p098_quadrilateral_area_17.jpg) |
Proposed Problem 98.
Quadrilateral Area, Centroid, Similarity.
Parallel lines. |
![Elearning 97](../problem/p097_similarity_elearning_17.jpg) |
Proposed
Problem 97. Similar Triangles,
Areas, Parallel lines. |
![Elearning 96](../problem/p096_parallelogram_elearning_17.jpg) |
Proposed Problem 96. Similar
Triangles, Incenters, Parallelogram,
Parallel lines. |
![Problem 95, Elearning](../problem/p095_similarity_elearning_17.jpg) |
Proposed Problem 95. Similar
Triangles, Inradii, Parallel lines. |
![Problem 94, Elearning](../problem/p094_triangle_elearning_17.jpg) |
Proposed Problem 94. Similar
Triangles, Circumcircles, Circumradii,
Parallel lines. |
![Elearning 93 Parallelogram](../problem/p093_triangle_elearning_17.jpg) |
Proposed Problem 93. Similar
Triangles, Circumcircles, Parallelogram,
Parallel lines. |
![Elearning Problem 92](../problem/p092_similarity_elearning_17.jpg) |
Proposed Problem 92. Similar
Triangles, Circumcircles, Circumradii, Parallel,
Parallel lines. |
![Elearning 91](../problem/p091_similarity_elearning_17.jpg) |
Proposed Problem 91. Similar
Triangles, Altitude, Parallel lines. |
![](taylor_circle_theorem.jpg) |
Taylor Circle Theorem Using TracenPoche Dynamic Software
Step-by-Step construction, Manipulation, and animation,
Parallel lines.
Henry Martyn Taylor and the blind student of mathematics
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![](../problem/p078_circle_angles_17.jpg) |
Proposed Problem 78: Angles of a Circle.
Perpendicular and parallel lines, Midpoint, Diameter, Chord, Cyclic
quadrilateral, Congruence.
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![Math Problem 77 Angles](../problem/p077_circle_angle_cyclic_17.jpg) |
Proposed Problem 77: Angles of a Circle.
Parallel lines, Cyclic quadrilateral.
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![](../problem/p076_square_circle_17.jpg) |
Proposed
Problem 76: Area of a Circle.
Square, Circle, Circular Sector,
Parallel lines.
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![](orthopole_triangle_170.jpg) |
Interactive Orthopole of
a Triangle: Using TracenPoche Dynamic
Geometry Software, Online
Step-by-Step construction, manipulation, and animation,
Parallel lines. |
![](../problem/p072_circle_secant_17.jpg) |
Proposed Problem 72: Intersecting Circles.
Cyclic quadrilateral, Chords,
Parallel lines.
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![](../problem/p070_squares_inscribed_17.jpg) |
Proposed Problem 70: Squares inscribed in a triangle, Similarity.
Parallel lines.
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![](../problem/p069_square_inscribed_17.jpg) |
Proposed Problem 69: Square inscribed in a triangle, Similarity.
Parallel lines.
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![](../problem/p062_square_diagonal_17.jpg) |
Proposed Problem 62: Square
Diagonal, Inscribed Circle, Parallel
lines. |
![](sangaku_cyclic_quad_170_2.jpg) |
Sangaku
Geometry Theorem: Cyclic Quadrilateral.
Inradii, Rectangle, 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.
Parallel lines. |
![](../triangle_square/triangle_square_22_170.jpg) |
Triangle and Squares 22
Parallel lines. |
![](../triangle_square/triangle_square_20_170.jpg) |
Triangle and Squares
20
Parallel lines. |
![](../escher/escher_illusion_170.jpg) |
News: Infants Are
Able To Detect The 'Impossible' At An Early Age
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![](../problem/p049_right_triangle_170.jpg) |
Proposed Problem 49.
Angles and right triangle, Parallel lines.
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![](../triangle_square/triangle_square_17_170.jpg) |
Triangle and Squares
17, Parallel lines.
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![](../problem/p039_angle_170.jpg) |
Problem 39.
Triangle, Incircle, Bisector, Cyclic Quadrilateral and angles,
Parallel lines. |
![](../problem/p029_problem_proof_170.jpg) |
Proposed Problem 29.
Right Triangle, altitude, incircle and inradius,
Parallel lines. Ten conclusions. |
![](../heron/heron_medians_170x100.jpg) |
Heron's Formula with medians
Parallel lines. |
![](../problem/p027_right_triangle_inc170.jpg) |
Proposed Problem 27
Right Triangle, incircles and inradius,
Parallel lines. |
![](../triangle_square/eyeball_theorem_170.jpg) |
Eyeball Theorem:
Animated Angle to Geometry Study.
Parallel lines. |
![](../problem/p020_right_triangle_inc170.jpg) |
Proposed problem
20
Right Triangle, Parallel lines,
incircles and inradii. |
![](../parallelogramsquare170x100.jpg) |
Parallelogram with Squares theorem Thébault's Theorem.
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![](../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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![](../Varignon_Wittenbauer_170.jpg) |
Varignon and Wittenbauer parallelograms. Quadrilateral: midpoints and
trisection points of the edges,
Parallel lines.
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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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