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Net of a Cone by marwanbajjour

Net of a Cone by marwanbajjour
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2019-04-12 06:33
CircleSolid GeometryGeometric Construction
This example demonstrates the construction of a cone's net (a sector). Key math concepts include cones, circles, sectors, angles, and vectors. It utilizes GeoGebra commands/objects like Point, Circle, Intersect, Ellipse, Vector, Translate, Arc, Segment, Angle, Line, Midpoint, If, Conic, OrthogonalLine, Tangent, Rotate, Center, Mirror, Polygon, CircleSector as per the construction summary. Suitable for high school solid geometry education or self-learning to understand the transformation between a cone and its 2D net.

GeoGebra Commands & Parameters

  1. Point(xAxis) → A
  2. Circle(A, r) → c
  3. Intersect(c, xAxis) → B, C
  4. Ellipse(E, D, C) → e
  5. Intersect(xAxis, yAxis) → F
  6. Vector(F, G) → u
  7. Translate(B, Vector[(u * h)]) → B'_1
  8. Translate(C, Vector[(u * h)]) → C'_1
  9. Translate(A, Vector[(u * h)]) → A'_1
  10. Translate(e, Vector[(u * h)]) → e'_1
  11. Arc(e'_1, C'_1, B'_1) → p_5
  12. Arc(e'_1, B'_1, C'_1) → q
  13. Segment(A'_1, A) → h_6
  14. Segment(A'_1, C'_1) → p
  15. Angle(A, A'_1, C'_1) → α
  16. Line(A, A'_1) → j
  17. Intersect(e'_1, j) → H, I
  18. Circle(I, r) → t
  19. Intersect(t, j, 2) → K
  20. Circle(K, I) → d_1
  21. Intersect(d_1, j, 2) → N
  22. Vector(H, N) → v
  23. Translate(H, Vector[(v * n)]) → H'_1
  24. Translate(D, Vector[(u * h)]) → D'
  25. Translate(E, Vector[(u * h)]) → E'
  26. Line(B, B'_1) → l
  27. Line(C, C'_1) → m
  28. Intersect(d_1, l, 1) → P
  29. Intersect(d_1, m, 1) → Q
  30. Vector(B'_1, P) → z
  31. Vector(C'_1, Q) → u_1
  32. Translate(B'_1, Vector[(z * n)]) → B''
  33. Translate(C'_1, Vector[(u_1 * n)]) → C''
  34. Midpoint(B'_1, A'_1) → R
  35. Midpoint(B, A) → S
  36. Line(R, S) → a_1
  37. Intersect(q, a_1) → T,
  38. Intersect(d_1, a_1, 1) → U
  39. Vector(T, U) → v_1
  40. Translate(T, Vector[(v_1 * n)]) → T'
  41. If(n < 1, B'', P) → B_1
  42. If(n < 1, T', U) → D_1
  43. If(n < 1, H'_1, N) → E_1
  44. If(n < 1, C'', Q) → F_1
  45. Conic(B_1, D_1, E_1, F_1, I) → g_1
  46. Conic(I, B_1, D_1, E_1, F_1) → h_1
  47. OrthogonalLine(I, j) → l_1
  48. OrthogonalLine(H, j) → b_2
  49. Intersect(m, l_1) → H_2
  50. Midpoint(H_2, C'_1) → I_2
  51. OrthogonalLine(C'_1, m) → i_2
  52. Segment(K, F_1) → m_4
  53. Translate(e, Vector[(u * h)]) → e'
  54. Tangent(A, e'_1) → a, b
  55. Intersect(e', b) → J, G_2
  56. Intersect(e', a) → L, R_2
  57. Segment(A, J) → f
  58. Segment(A, L) → g
  59. Circle(I, sqrt(h^(2) + r^(2))) → k
  60. Intersect(k, j, 1) → M
  61. Circle(M, sqrt(h^(2) + r^(2))) → s
  62. Segment(M, I) → i
  63. Rotate(I, γ, M) → I'_1
  64. Rotate(I, (-γ), M) → I'_2
  65. OrthogonalLine(I'_2, i_2) → b_1
  66. Intersect(b_2, b_1) → O
  67. Midpoint(H, O) → V
  68. Circle(V, O) → c_1
  69. Vector(O, I'_2) → w
  70. Center(g_1) → W
  71. Segment(W, F_1) → e_1
  72. Vector(H, A) → w_1
  73. Translate(H, Vector[(w_1 * (n - 1))]) → H'
  74. If(n < 1, H, If[n < 2, H', A]) → Z
  75. Segment(H, Z) → f_1
  76. Rotate(I, (-δ), M) → I'
  77. Vector(L, I') → z_1
  78. Translate(c_1, Vector[(w * (n - 2))]) → k_1
  79. Center(k_1) → A_1
  80. Intersect(k_1, j) → C_1, Q_1
  81. Rotate(C_1, (180° * (n - 2)), A_1) → G_1
  82. If(n < 2, H, If[n ≤ 3, G_1, I'_2]) → H_1
  83. Mirror(H_1, j) → I_1
  84. Translate(L, Vector[(z_1 * (n - 2))]) → L'
  85. If(n < 2, L, If[n ≤ 3, L', I']) → J_1
  86. Mirror(J_1, j) → K_1
  87. Conic(I_1, H_1, J_1, I, K_1) → p_1
  88. Vector(A, M) → i_1
  89. Translate(A, Vector[(i_1 * (n - 2))]) → A'
  90. If(n < 2, A, If[n ≤ 3, A', M]) → L_1
  91. Tangent(L_1, p_1) → j_1, m_1
  92. Intersect(p_1, m_1, 1) → M_1
  93. Intersect(p_1, j_1, 1) → N_1
  94. Polygon(L_1, M_1, N_1) → poly1, n_1, l_2, m_2
  95. Arc(p_1, N_1, M_1) → q_1
  96. Line(L_1, b_2) → r_1
  97. Intersect(p_1, r_1, 1) → O_1
  98. Intersect(p_1, r_1, 2) → P_1
  99. Arc(p_1, P_1, O_1) → s_1
  100. Polygon(L_1, O_1, I_1) → poly2, i_3, l_3, o_1
  101. Polygon(L_1, H_1, P_1) → poly3, p_2, l_4, h_2
  102. Arc(p_1, O_1, I_1) → t_1
  103. Arc(p_1, H_1, P_1) → c_2
  104. Segment(L_1, I_1) → a_2
  105. Segment(L_1, H_1) → d_2
  106. Arc(p_1, H_1, I_1) → e_2
  107. Polygon(I_1, L_1, H_1) → poly4, h_3, i_4, l_5
  108. CircleSector(M, I'_2, I'_1) → f_2
  109. CircleSector(M, I'_2, I'_1) → g_2
  110. Arc(p_1, H_1, I_1) → k_2
  111. Segment(M_1, L_1) → j_2
  112. Segment(N_1, L_1) → n_2
  113. Polygon(I_1, L_1, H_1) → poly5, h_4, i_5, l_6
  114. Arc(p_1, H_1, I_1) → q_2
  115. Polygon(J, A, L) → poly6, l_7, j_3, a_3
  116. Midpoint(g) → K_2
  117. Midpoint(f_1) → L_2
  118. Point(j) → M_2
  119. Midpoint(I_1, A') → N_2
  120. Midpoint(A', H_1) → O_2
  121. Line(M_2, r_1) → p_3
  122. Point(p_3) → P_2
  123. Segment(I_1, H_1) → q_3
  124. Intersect(k_2, q_3, 2) → S_2