Conditions for Triangles to be Congruent

Conditions for Triangles to be Congruent
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2017-05-09 12:10
This example demonstrates the conditions for triangles to be congruent. By constructing triangles and related elements such as side lengths, angles, and rotations, students can visually understand the congruence theorems. Commands used include Segment, Circle, Point, Intersect, Polygon, Angle, and Rotate. Suitable for junior high school geometry.

GeoGebra Commands & Parameters

  1. Segment(A_1, B_1) → a_1
  2. Circle(A_1, B_1) → circle1_1
  3. Circle(C_1, B_1) → circle1_2
  4. Segment(B_1, C_1) → b_1
  5. Segment(C_1, A_1) → c_1
  6. Point(Circle[E_1, abs(a_1)]) → D_1
  7. Circle(D_1, c_1) → circle1_3
  8. Circle(E_1, b_1) → circle1_4
  9. Intersect(circle1_3, circle1_4, 1) → F_1
  10. Segment(D_1, E_1) → d_1
  11. Segment(E_1, F_1) → e_1
  12. Segment(D_1, F_1) → f_1
  13. Polygon(A_1, B_1, C_1) → poly1_1, mc_1, ma_1, mb_1
  14. Polygon(D_1, E_1, F_1) → poly1_2, mf_1, md_1, me_1
  15. Circle(B_2, A_2) → circle2_1
  16. Circle(B_2, C_2) → circle2_2
  17. Segment(A_2, B_2) → a_2
  18. Segment(B_2, C_2) → b_2
  19. Segment(A_2, C_2) → c_2
  20. Angle(C_2, B_2, A_2) → α_21
  21. Circle(E_2, a_2) → circle2_3
  22. Circle(E_2, b_2) → circle2_4
  23. Point(circle2_3) → D_2
  24. Rotate(D_2, (-α_21), E_2) → E_2'
  25. Line(E_2, E_2') → line2'
  26. Intersect(circle2_4, line2', 2) → F_2
  27. Segment(D_2, E_2) → d_2
  28. Segment(E_2, F_2) → e_2
  29. Segment(D_2, F_2) → f_2
  30. Angle(F_2, E_2, D_2) → α_22
  31. Polygon(A_2, B_2, C_2) → poly2_1, mc_2, ma_2, mb_2
  32. Polygon(D_2, E_2, F_2) → poly2_2, mf_2, md_2, me_2
  33. Segment(B_{34}, C_{34}) → b_{34}
  34. Circle(B_{34}, C_{34}) → circle34_1
  35. Segment(B_{34}, A_{34}) → a_{34}
  36. Segment(C_{34}, A_{34}) → c_{34}
  37. Angle(C_{34}, B_{34}, A_{34}) → α_31
  38. Angle(B_{34}, C_{34}, A_{34}) → β_31
  39. Circle(E_{34}, b_{34}) → circle34_2
  40. Point(circle34_2) → F_{34}
  41. Rotate(F_{34}, α_31, E_{34}) → F_{34}'
  42. Rotate(E_{34}, (-β_31), F_{34}) → E_{34}'
  43. Line(E_{34}, F_{34}') → line34_1'
  44. Line(F_{34}, E_{34}') → line34_2'
  45. Intersect(line34_1', line34_2') → D_{34}
  46. Segment(D_{34}, E_{34}) → d_{34}
  47. Segment(E_{34}, F_{34}) → e_{34}
  48. Segment(D_{34}, F_{34}) → f_{34}
  49. Angle(F_{34}, E_{34}, D_{34}) → α_32
  50. Angle(D_{34}, F_{34}, E_{34}) → β_32
  51. Polygon(A_{34}, B_{34}, C_{34}) → poly34_1, ma_3, mb_3, mc_3
  52. Polygon(D_{34}, E_{34}, F_{34}) → poly34_2, md_3, me_3, mf_3
  53. Angle(C_{34}, A_{34}, B_{34}) → β_41
  54. Angle(F_{34}, D_{34}, E_{34}) → β_42
  55. Segment(A_5, C_5) → c_5
  56. OrthogonalLine(C_5, c_5) → line5_1'
  57. Point(line5_1') → B_5
  58. Segment(A_5, B_5) → a_5
  59. Segment(B_5, C_5) → b_5
  60. Circle(D_5, c_5) → circle5_1
  61. Point(circle5_1) → F_5
  62. Segment(D_5, F_5) → f_5
  63. OrthogonalLine(F_5, f_5) → line5_2'
  64. Circle(D_5, a_5) → circle5_2
  65. Intersect(circle5_2, line5_2', 1) → E_5
  66. Segment(D_5, E_5) → d_5
  67. Segment(E_5, F_5) → e_5
  68. Angle(A_5, C_5, B_5) → α_51
  69. Angle(D_5, F_5, E_5) → α_52
  70. Polygon(A_5, B_5, C_5) → poly5_1, mc_5, ma_5, mb_5
  71. Polygon(D_5, E_5, F_5) → poly5_2, mf_5, md_5, me_5
  72. Segment(A_6, B_6) → a_6
  73. Circle(B_6, A_6) → circle6_1
  74. Circle(A_6, C_6) → circle6_2
  75. Segment(B_6, C_6) → b_6
  76. Segment(A_6, C_6) → c_6
  77. Circle(D_6, a_6) → circle6_3
  78. Point(circle6_3) → E_6
  79. Circle(D_6, c_6) → circle6_4
  80. Angle(C_6, B_6, A_6) → α_61
  81. Rotate(D_6, (-α_61), E_6) → F_6'
  82. Line(E_6, F_6') → line6'
  83. Intersect(circle6_4, line6', 1) → F_6
  84. Segment(D_6, E_6) → d_6
  85. Segment(E_6, F_6) → e_6
  86. Segment(D_6, F_6) → f_6
  87. Angle(F_6, E_6, D_6) → α_62
  88. Polygon(A_6, B_6, C_6) → poly6_1, mc_6, ma_6, mb_6
  89. Polygon(D_6, E_6, F_6) → poly6_2, mf_6, md_6, me_6
  90. Segment(A_7, B_7) → a_7
  91. Segment(B_7, C_7) → b_7
  92. Segment(A_7, C_7) → c_7
  93. Segment(D_7, E_7) → d_7
  94. Angle(C_7, A_7, B_7) → α_71
  95. Angle(A_7, B_7, C_7) → β_71
  96. Angle(B_7, C_7, A_7) → γ_71
  97. Rotate(E_7, (-α_71), D_7) → F_71'
  98. Rotate(D_7, β_71, E_7) → F_72'
  99. Line(D_7, F_71') → line7_1'
  100. Line(E_7, F_72') → line7_2'
  101. Intersect(line7_1', line7_2') → F_7
  102. Segment(D_7, F_7) → e_7
  103. Segment(E_7, F_7) → f_7
  104. Angle(F_7, D_7, E_7) → α_72
  105. Angle(D_7, E_7, F_7) → β_72
  106. Angle(E_7, F_7, D_7) → γ_72
  107. Polygon(A_7, B_7, C_7) → poly7_1, mc_7, ma_7, mb_7
  108. Polygon(D_7, E_7, F_7) → poly7_2, mf_7, md_7, me_7

AI Drawing Prompt Reference

Draw two triangles with labeled vertices and sides, use circles to represent side lengths and angle symbols for the three interior angles, demonstrate the conditions for triangle congruence through rotation and intersection operations, including side-side-side, side-angle-side, and angle-side-angle cases, with different colors to distinguish the two triangles for observing congruence relationships.
The prompt above was compiled from the original drawing commands and is for reference only.