Geometric Transformations with Piecewise Functions (Part 4)

Geometric Transformations with Piecewise Functions (Part 4)
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2024-01-24 02:27
This GeoGebra example combines 3D-related geometry constructs, transformations, and piecewise behavior to visualize how circle/arc and line structures relate to function behavior. It demonstrates a dynamic interplay between geometric operations and analytic ideas such as difference-and-slope (rates/changes) and step-function style piecewise definitions. The key concepts include rotations and mirror/translation/dilation as geometric transformations, circle and circular-arc geometry, angle construction, orthogonal lines, and piecewise (step) logic. Construction highlights: Rotate, Mirror, Translate, and Dilate generate transformed configurations using vectors and rays (Vector, Ray). Circle and CircleArc create circular geometry; Line, Segment, Intersect, and Angle determine key intersections and measured angles; OrthogonalLine provides perpendicular construction. Points organize the geometry, and If is used to encode the piecewise conditions that drive the function-like outcome (objects such as eq1, f appear in the construction). Suitable for upper secondary and early college learners for lessons on geometric construction, transformation geometry, and graphing piecewise functions with slope interpretation.

GeoGebra Commands & Parameters

  1. Rotate(N, If[1 < a ≤ 2, (-(a - 1)), -1], M) → N'
  2. CircleArc(M, N', N) → c
  3. Mirror(c, yAxis) → c'
  4. Rotate(C, If[1 < a ≤ 2, (-(a - 1)), -1], N') → C'
  5. Rotate(C', -2, M) → C''_{1}
  6. Rotate(C''_{1}, -2, M) → O
  7. Line(O, C''_{1}) → t
  8. Line(M, t) → g_1
  9. Intersect(c', g_1) → H,
  10. Line(C', C''_{1}) → h
  11. Line(M, h) → i
  12. Intersect(c, i, 1) → D
  13. Angle(D, M, H) → β
  14. Rotate(D, If[5 < a ≤ 6, ((a - 5) * β), β], M) → D'
  15. Mirror(D', M) → D''
  16. Segment(D', D'') → s_1
  17. Circle(H, s_1 / 7) → t_1
  18. Intersect(t_1, s_1, 1) → R
  19. Mirror(H, R) → H'
  20. Mirror(R, H') → R'
  21. Mirror(H', R') → H''
  22. Mirror(C', yAxis) → C''
  23. Line(M, C'') → n_2
  24. OrthogonalLine(C'', n_2) → p_2
  25. Line(M, p_2) → q_2
  26. Point(q_2) → U
  27. Segment(((-r), 0), (r, 0)) → f
  28. Rotate(B, If[7.5 < a ≤ 8.5, ((-(a - 7.5)) * 2), -2], (0, 0)) → B'_{2}
  29. Line((0, 0), B'_{2}) → b
  30. OrthogonalLine(B'_{2}, b) → f_1
  31. Circle((0, 0), r) → d_1
  32. Vector(I, J) → v
  33. Rotate((r, 0), 1, (0, 0)) → K
  34. Rotate((r, 0), 3, (0, 0)) → L
  35. Mirror(K, y = 0) → K'
  36. Dilate(M, If[0 < a ≤ 1, 1 - a, 0], N) → M'
  37. Vector(M, M') → w
  38. Translate(f, w) → f'_{2}
  39. Mirror(N', yAxis) → N''
  40. Mirror(A, yAxis) → A'
  41. Circle(N', r - c) → d
  42. Segment(N', C') → g
  43. Mirror(N', yAxis) → N''_{1}
  44. Segment(N''_{1}, C'') → g'
  45. Rotate(C', -1, M) → C''_{2}
  46. Angle(B, M, D) → α
  47. Rotate(B, If[2 < a ≤ 3, ((a - 2) * α), α], M) → B'
  48. Mirror(B', M) → B''
  49. Segment(B'', B') → j
  50. Dilate(M, If[3 < a ≤ 4, 4 - a, 0], C''_{2}) → M'_{1}
  51. Vector(M, M'_{1}) → u
  52. Translate(B'', u) → B'''
  53. Translate(B', u) → B''_{1}
  54. Segment(B''', B''_{1}) → j'
  55. Rotate(C''_{2}, If[4 < a ≤ 5, a - 4, 1], M) → E
  56. Rotate(C''_{2}, If[4 < a ≤ 5, (-(a - 4)), -1], M) → F
  57. CircleArc(M, C''_{2}, E) → e
  58. CircleArc(M, F, C''_{2}) → k
  59. Circle(E, j / 2 - e) → p
  60. Line(M, E) → l
  61. OrthogonalLine(E, l) → m
  62. Rotate(M, ((-pi)) / 2, E) → M'_{2}
  63. Ray(E, M'_{2}) → n
  64. Intersect(p, n, 1) → G
  65. Rotate(M, pi / 2, E) → M'_{3}
  66. Segment(E, G) → q
  67. Line(M, C''_{2}) → s
  68. Mirror(E, s) → E'
  69. Mirror(G, s) → G'
  70. Segment(E', G') → q'
  71. Rotate(C''_{1}, -1, M) → P
  72. Segment(D', D'') → h_1
  73. Dilate(M, If[6 < a ≤ 7, 7 - a, 0], P) → M'_{4}
  74. Vector(M, M'_{4}) → u_1
  75. Translate(D', u_1) → D''_{1}
  76. Translate(D'', u_1) → D'''
  77. Segment(D''_{1}, D''') → i_1
  78. Rotate(P, If[7 < a ≤ 8, a - 7, 1], M) → P'
  79. Line(M, P) → j_1
  80. Mirror(P', j_1) → P''
  81. CircleArc(M, P, P') → c_1
  82. CircleArc(M, P'', P) → e_1
  83. Circle(P', h_1 / 2 - c_1) → k_1
  84. Circle(P'', h_1 / 2 - c_1) → p_1
  85. Line(M, P') → l_1
  86. OrthogonalLine(P', l_1) → m_1
  87. Rotate(M, ((-pi)) / 2, P') → M'_{5}
  88. Ray(P', M'_{5}) → n_1
  89. Intersect(k_1, n_1) → Q,
  90. Segment(P', Q) → q_1
  91. Mirror(Q, j_1) → Q'
  92. Segment(P'', Q') → r_1
  93. Mirror(R', H'') → R''
  94. Mirror(H'', R'') → H'''
  95. Mirror(R'', H''') → R'''
  96. Dilate(H, If[8 < a ≤ 9, 9 - a, 0], R) → H'_{1}
  97. Segment(H, H'_{1}) → a_1
  98. Rotate(H, If[9 < a ≤ 10, ((a - 9) * pi), pi], R) → H'_{2}
  99. Segment(R, H'_{2}) → b_1
  100. Rotate(R, If[10 < a ≤ 11, ((a - 10) * pi), pi], H') → R'_{1}
  101. Segment(H', R'_{1}) → f_2
  102. Rotate(H', If[11 < a ≤ 12, ((a - 11) * pi), pi], R') → H''_{1}
  103. Segment(R', H''_{1}) → g_2
  104. Rotate(R', If[12 < a ≤ 13, ((a - 12) * pi), pi], H'') → R''_{1}
  105. Segment(H'', R''_{1}) → h_2
  106. Rotate(H'', If[13 < a ≤ 14, ((a - 13) * pi), pi], R'') → H'''_{1}
  107. Segment(R'', H'''_{1}) → i_2
  108. Rotate(R'', If[14 < a ≤ 15, ((a - 14) * pi), pi], H''') → R'''_{1}
  109. Segment(H''', R'''_{1}) → j_2
  110. Line(M, C'') → k_2
  111. Angle(U, M, H'') → γ
  112. Dilate(H'', If[15.5 < a ≤ 16.5, 16.5 - a, 0], C'') → H'''_{2}
  113. Vector(H'', H'''_{2}) → v_1
  114. Dilate(R', If[15.5 < a ≤ 16.5, 16.5 - a, 0], C'') → R''_{2}
  115. Vector(R', R''_{2}) → w_1
  116. Translate(R', w_1) → R''_{3}
  117. Translate(H''_{1}, w_1) → S
  118. Segment(R''_{3}, S) → l_2
  119. Rotate(R''_{3}, If[15.5 < a ≤ 16.5, ((-(a - 15.5)) * γ), (-γ)], R''_{2}) → T
  120. Rotate(S, If[15.5 < a ≤ 16.5, ((-(a - 15.5)) * γ), (-γ)], R''_{2}) → S'
  121. Segment(T, S') → m_2
  122. Rotate(C'', If[16.5 < a ≤ 17.5, ((a - 16.5) * 0.28), 0.28], M) → C'''
  123. CircleArc(M, C'', C''') → c_2
  124. Circle(C''', (0.14 * s_1) - c_2) → d_2
  125. Line(C''', M) → r_2
  126. OrthogonalLine(C''', r_2) → s_2
  127. Rotate(M, ((-pi)) / 2, C''') → M'_{6}
  128. Ray(C''', M'_{6}) → t_2
  129. Intersect(d_2, t_2, 1) → V
  130. Segment(C''', V) → a_2
  131. If(8 < a ≤ 15, 0.75, 0.25) → o_1

AI Drawing Prompt Reference

Draw a dynamic geometric figure with a circular arc centered at a point, passing through two rotated points, and its mirror image across the vertical axis. From points on the arc, generate additional points and segments via rotations and reflections, constructing angles and perpendicular lines. Add a horizontal segment as a function graph, then translate it using a vector. Construct a circle, several segments, and perpendiculars, creating symmetric shapes through rotations and reflections, with piecewise conditions adjusting rotation angles based on a parameter. The final composition includes arcs, lines, segments, angles, and a piecewise-defined function.
The prompt above was compiled from the original drawing commands and is for reference only.