Angle Bisector and Perpendicular Bisector Construction

Angle Bisector and Perpendicular Bisector Construction
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2019-04-12 16:03
This example demonstrates how to construct angle bisectors and perpendicular bisectors of a triangle using GeoGebra. Key math concepts include angle bisectors, perpendicular bisectors, medians, rotations, reflections, etc. Construction highlights involve commands like LineBisector, Segment, Rotate, Line, OrthogonalLine, Intersect, Mirror, CircleArc, Circle, Point, Polygon, Angle, PointIn, and Midpoint. Suitable for high school geometry construction lessons and learning.

GeoGebra Commands & Parameters

  1. LineBisector(A, B) → l_4
  2. Segment(A, B) → f
  3. Rotate(B, gam, A) → B'
  4. Line(A, B') → m_4
  5. OrthogonalLine(A, m_4) → n_4
  6. Intersect(l_4, n_4) → Q
  7. Mirror(Q, f) → Q'
  8. CircleArc(Q', B, A) → c_4
  9. Circle((A + B) / 2, B) → c
  10. Point(c_4) → C
  11. Line(C, yAxis) → g
  12. Line(G, F) → h
  13. Intersect(g, h) → E_1
  14. Line(A, B) → i
  15. Intersect(i, g) → G_1
  16. Polygon(G, E_1, G_1, A) → ct1, d, e, g_1, a_1
  17. Polygon(E_1, F, B, G_1) → ct2, e_1, f_1, b_1, g_2
  18. Segment(A, G) → j
  19. Segment(B, F) → k
  20. Line(A, C) → l
  21. Line(C, B) → m
  22. OrthogonalLine(C, l) → n
  23. OrthogonalLine(A, l) → p
  24. OrthogonalLine(C, m) → q
  25. OrthogonalLine(B, m) → r
  26. Polygon(A, C, 4) → mnohoúhelník1, h_1, i_1, j_1, k_1, D, E
  27. Line(E, D) → l_1
  28. OrthogonalLine(B, l) → s
  29. OrthogonalLine(A, m) → t
  30. Intersect(s, l) → H
  31. Intersect(m, t) → I
  32. Intersect(l_1, s) → L
  33. Polygon(A, H, L, E) → ct3, a_2, h_2, l_2, k_2
  34. Polygon(H, C, D, L) → ct4, h_3, c_1, j_2, l_3
  35. Polygon(C, B, 4) → mnohoúhelník2, m_1, n_1, p_1, q_1, M, N
  36. Line(N, M) → r_1
  37. Intersect(t, r_1) → O
  38. Polygon(I, B, M, O) → ct5, i_2, b_2, m_2, o
  39. Polygon(C, I, O, N) → ct6, c_2, i_3, o_1, n_2
  40. Segment(A, H) → s_1
  41. Segment(H, C) → t_1
  42. Segment(C, D) → d_1
  43. Segment(D, L) → f_2
  44. Segment(L, E) → p_2
  45. Segment(E, A) → q_2
  46. Segment(L, H) → r_2
  47. Segment(G_1, E_1) → s_2
  48. Segment(G, E_1) → t_2
  49. Segment(E_1, F) → d_2
  50. Segment(C, I) → e_2
  51. Segment(I, B) → f_3
  52. Segment(B, M) → g_3
  53. Segment(M, O) → j_3
  54. Segment(O, I) → k_3
  55. Segment(N, O) → m_3
  56. Segment(N, C) → n_3
  57. Segment(G_1, A) → p_3
  58. Segment(C, G_1) → q_3
  59. Segment(H, B) → r_3
  60. Segment(A, I) → s_3
  61. Angle(A, C, B) → α
  62. Polygon(A, B, C) → t1, c_3, a_3, b_3
  63. PointIn(ct1) → Bodct1
  64. PointIn(ct6) → Bodct6_1
  65. PointIn(ct6) → Bodct6
  66. Segment(G, F) → t_3
  67. Segment(E, D) → d_3
  68. Segment(N, M) → e_3
  69. Segment(E, B) → f_4
  70. Segment(C, G) → g_4
  71. Segment(D, B) → h_4
  72. Segment(Bodct6, A) → i_4
  73. Segment(A, M) → j_4
  74. Segment(C, F) → k_4
  75. Midpoint(Bodct6, B) → K
  76. Midpoint(L, A) → P
  77. Angle(B, A, B') → β
  78. Polygon(B, A, 4) → mnohoúhelník3, p_4, q_4, r_4, s_4, R, S
  79. Polygon(C, B, 4) → mnohoúhelník4, t_4, a_4, b_4, d_4, T, U
  80. Polygon(A, C, 4) → mnohoúhelník5, e_4, f_5, g_5, h_5, V, W
  81. Polygon(C, B, 4) → mnohoúhelník6, i_5, j_5, k_5, l_5, Z, A_1
  82. Polygon(A, C, 4) → mnohoúhelník7, m_5, n_5, p_5, q_5, B_1, C_1

AI Drawing Prompt Reference

Draw a triangle ABC and construct angle bisectors and perpendicular bisectors. First, construct angle bisectors AD and BE, then construct perpendicular bisector DE. Next, find the circumcenter Q and construct a circular arc and a circle through Q. Then, construct medians and altitudes, and their related perpendiculars and intersections. Finally, based on these lines and points, construct multiple triangles and quadrilaterals, including the mid-point quadrilateral, the orthic quadrilateral, and the circumcircle.
The prompt above was compiled from the original drawing commands and is for reference only.