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Rhombus Properties Illustrated by Mrs. Cole

Rhombus Properties Illustrated by Mrs. Cole
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2019-01-22 11:24
PolygonAngleTransformation
This example illustrates the properties of a rhombus without involving segment lengths or angle measures. It demonstrates the symmetry and angle relationships of a rhombus using commands such as Circle, Line, Intersect, CircleArc, Point, Segment, Min, Dilate, Angle, Rotate, CircleSector, Polygon, Vector, and Translate. Suitable for middle school and above students to learn about the geometric properties of a rhombus.

GeoGebra Commands & Parameters

  1. Circle(B, A) → f
  2. Circle(A, B) → c
  3. Line(A, B) → b
  4. Intersect(c, b, 2) → C
  5. CircleArc(A, B, C) → d
  6. Point(d) → D
  7. Segment(D, B) → s
  8. Circle(D, A) → e
  9. Intersect(e, f, 2) → E
  10. Segment(A, E) → n
  11. Intersect(n, s) → L
  12. Segment(A, B) → a
  13. Segment(A, D) → g
  14. Segment(D, E) → h
  15. Segment(E, B) → i
  16. Min(g, h) → j
  17. Dilate(B, If[0 < l ≤ 1, 1 - l, 0], A) → B'
  18. Segment(B, B') → m
  19. Angle(E, B, A) → α
  20. Angle(D, E, B) → β
  21. Rotate(B, If[1 < l ≤ 2, ((-(l - 1)) * α), α], B) → B'_1
  22. Rotate(B', If[1 < l ≤ 2, ((-(l - 1)) * α), (-α)], B) → B''
  23. Segment(B'_1, B'') → m'
  24. Rotate(B'_1, If[2 < l ≤ 3, ((-(l - 2)) * β), (-β)], E) → J
  25. Rotate(B'', If[2 < l ≤ 3, ((-(l - 2)) * β), (-β)], E) → B'''
  26. Segment(J, B''') → m''
  27. Rotate(J, If[3 < l ≤ 4, ((-(l - 3)) * α), (-α)], D) → J'
  28. Rotate(B''', If[3 < l ≤ 4, ((-(l - 3)) * α), (-α)], D) → K
  29. Segment(J', K) → m'''
  30. Circle(B, (0.2 * j)) → k
  31. Circle(E, (0.2 * j)) → p
  32. Intersect(p, m'', 1) → F
  33. Intersect(p, m', 1) → G
  34. Intersect(k, m', 1) → H
  35. Intersect(k, m, 1) → I
  36. CircleSector(B, H, I) → q
  37. CircleSector(E, F, G) → r
  38. Polygon(A, B, E, D) → poly1, a_1, b_1, e_1, d_1
  39. Dilate(B, If[5 < l ≤ 6, 6 - l, 0], D) → B'_2
  40. Vector(B, B'_2) → u
  41. Translate(q, u) → q'
  42. Rotate(q', If[6 < l ≤ 7, ((l - 6) * π), 3.141592653589793], D) → q''
  43. Dilate(E, If[7 < l ≤ 8, 8 - l, 0], A) → E'
  44. Vector(E, E') → v
  45. Translate(r, v) → r'
  46. Rotate(r', If[8 < l ≤ 9, ((-(l - 8)) * π), -3.141592653589793], A) → r''
  47. Dilate(D, If[9 < l ≤ 10, 10 - l, 0], L) → D'
  48. Vector(D, D') → w
  49. Min(n / 2, s / 2) → o
  50. Circle(L, (0.2 * o)) → t
  51. Intersect(t, s, 2) → M
  52. Intersect(t, n, 2) → N
  53. CircleSector(L, M, N) → c_1
  54. Segment(D, D') → f_1
  55. Dilate(L, If[10 < l ≤ 11, 11 - l, 0], B) → L'
  56. Circle(D, (0.2 * j)) → h_1
  57. Intersect(k, s) → P,
  58. Intersect(s, f_1) → Q
  59. Intersect(h_1, s, 1) → O
  60. Circle(A, (0.2 * j)) → k_1
  61. Intersect(k_1, m, 1) → R
  62. Intersect(k_1, n, 1) → S
  63. Intersect(k_1, m''', 1) → T
  64. Intersect(h_1, m'', 1) → U
  65. CircleSector(D, O, U) → q_1
  66. Dilate(A, If[11 < l ≤ 12, 12 - l, 0], L) → A'
  67. Segment(A, A') → i_1
  68. Dilate(L, If[12 < l ≤ 13, 13 - l, 0], E) → L'_1
  69. Segment(L, L'_1) → j_1
  70. Intersect(p, m'', 1) → V
  71. Intersect(p, n, 1) → W
  72. CircleSector(A, S, T) → s_1
  73. CircleSector(B, P, I) → p_1
  74. Intersect(p, m', 1) → Z
  75. CircleSector(E, W, Z) → r_1
  76. Segment(L, L') → g_1
  77. Rotate(L, If[13 < l ≤ 14, ((-(l - 13)) * π), -3.141592653589793], L) → L'_2
  78. Rotate(L', If[13 < l ≤ 14, ((-(l - 13)) * π), -3.141592653589793], L) → L''
  79. Segment(L'_2, L'') → l_1
  80. Rotate(L, If[14 < l ≤ 15, ((-(l - 14)) * π), 3.141592653589793], L) → L'_3
  81. Rotate(L'_1, If[14 < l ≤ 15, ((-(l - 14)) * π), 3.141592653589793], L) → A_1
  82. Segment(L'_3, A_1) → m_1
  83. Rotate(q_1, If[15 < l ≤ 16, ((-(l - 15)) * α / 2), ((-α)) / 2], D) → t_1
  84. Rotate(p_1, If[15 < l ≤ 16, ((-(l - 15)) * α / 2), ((-α)) / 2], B) → c_2
  85. Rotate(s_1, If[16 < l ≤ 17, ((-(l - 16)) * β / 2), ((-β)) / 2], A) → d_2
  86. Rotate(r_1, If[16 < l ≤ 17, ((-(l - 16)) * β / 2), ((-β)) / 2], E) → e_2
  87. Rotate(c_1, If[17 < l ≤ 18, ((l - 17) * π / 2), 1.5707963267948966], L) → f_2