Geometry
1. Internals/externals angles
2. Another method to prove the Pythagorean theorem
3. How to build an angle with a protractor?
4. Unit conversions of length
5. Know how to differentiate perimeter and area
6. The laughing cow and the area of the circle by:=)
7. Paper formats and the geometric sequence
8. The faces of the folded / unfolded Cube
9. Cervian triangle
10. All of these figures are squares!
11. Spherical polygons
12. Pythagora in non-Euclidean geometry
13. Euclidian vs Spherical geometry
14. Euler's relation for platonic solids
15. Euler relation and polyhedra
16. Haga's Theorem
17. Opposite angles of a parallelogram
18. Consecutive angles of a parallelogram
19. Sum of interior angles of a polygon
20. Reflect on geometric areas
21. The 13 knot rope
22. Gaussian curvature
23. Sum of the angles of a triangle is not always 180°
24. The Fibonacci's elephant
25. triang
26. Area of obtuse or acute triangle
27. Proof without words : Steiner'ellipse of a triangle
28. Proof without words: Median to hypotenuse
29. The 3-level formula for volumes calculus
30. Height of the equilateral triangle
31. Circumscribed and equilateral triangle
32. A strange triangular puzzle. Can you explain that?
33. Area of the circle by the triangle or the rectangle
34. Proof without words : Area of a parallelogramm
35. View perimeter and area of polygons
36. The butterfly of Thales
37. 3D and 2D central symmetry
38. Axial symmetry
39. Central symmetry
40. Axial symmetry
41. Kite
42. Kite
43. PacMath (4) : Circumference of the circle
44. Unwrapping an oblique section of a prism
45. Geometric fishes
46. Funny geometric forms to associate
47. Puzzles with squares and triangles
48. The Faces of the Dice
49. Number of columns and unit conversions
50. Thales and the pyramids
51. Geometric workshop for primary school
52. Symmetry created by the leafing of a book
53. Faces,sommets arêtes
54. Interactive construction imagery
55. By doubling the diameter of a pie, do you double its surface?
56. Cutouts and folds to study symmetry and translation
57. Challenge of the two cylinders
58. Everything you need to know about the circle
59. The 13 knote rope
60. Overview of the particular lines of the triangle
61. Convexe or concave polygons
62. The sum of the angles of a quadrilateral
63. Proof without words : Sum of external angles of a polygon
64. Folding / Unfolding (symetries and rotations)
65. Surfaces calculus
66. The rectangle at the heart of the areas of geometric figures
67. How to square a rectangle?
68. The kite and his properties
69. The Wardrobe of Pythagoras
70. Parts of disc and circle
71. Johnson circles
72. The goat clipper (hyperclassic problem)
73. Median of the right triangle
74. Measuring a height by two methods
75. Pythagora by water
76. Proof without words: Mid segments in a triangle
77. Daily math (1) : the surface to paint
78. Proof without words: Intersecting chords theorem
79. Area of regular polygons
80. Proof without words: volume of a pyramide
81. Area of the circle with "La vache qui rit"
82. Right triangle theorems (interactive applet)
83. Circle theorems (interactive applet)
84. Inaccessible measurements
85. Volume of the Cube explained by pyramides
86. Kite et cerf volant
87. Conics(I)
88. Area of the circle with a chocolate cake
89. Des figures géométriques en puzzle
90. Angulo (savoir estimer un angle à l'oeil)
91. Construction: la bissectrice d'un angle
92. Unit Cube and its diagonals
93. The angles with PacMath
94. Geofish : Geometric fish :=)
95. The various triangles
96. Le memory des formes
97. Why are these columns in the conversion tables?
98. Area of a regular polygone
99. The particular lines of the triangle in the same visual
100. The lineage of triangles
101. Sharing the pizza(pizza theorem)
102. Around the sphere
103. Geometric polygonal peacock
104. Angles and diagonals of regular polygons
105. The wheel of angles
106. Euclidean,Spherical and Hyperbolic geometries
107. Different methods for the area of a Triangle