Area of a Triangle

Area of a Triangle
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2021-07-09 08:52
In collections Perimeter & Area
This example demonstrates how to calculate the area of a triangle using geometric constructions. Key mathematical concepts include area formulas, similar triangles, and geometric transformations. Construction involves GeoGebra commands such as Point, Polygon, OrthogonalLine, and Dilate. Suitable for middle or high school mathematics to understand geometric principles and practical applications.

GeoGebra Commands & Parameters

  1. Point(Ray[A, A + (1, 0)]) → B
  2. PointIn(d) → C
  3. Polygon(A, B, C) → t1, f, a, b
  4. OrthogonalLine(C, g) → h
  5. Intersect(g, h) → C_{1}
  6. Midpoint(C, C_{1}) → D
  7. Midpoint(b) → E
  8. Midpoint(a) → G
  9. Dilate(C, If[0 < c ≤ 1, 1 - c, 0], D) → F'
  10. Segment(C, F') → i
  11. Dilate(D, If[1 < c ≤ 2, 2 - c, 0], C_{1}) → D'
  12. Segment(D, D') → j
  13. Rotate(C, If[2 < c ≤ 3, ((c - 2) * π), π], D) → F'_{1}
  14. Rotate(F', If[2 < c ≤ 3, ((c - 2) * π), π], D) → F''
  15. Segment(F'_{1}, F'') → i'
  16. Dilate(E, If[0 < c ≤ 2, (0.5 * (2 - c)), 0], D) → E'
  17. Segment(E, E') → k
  18. Dilate(G, If[0 < c ≤ 2, (0.5 * (2 - c)), 0], D) → G'
  19. Segment(G, G') → l
  20. Angle(C, B, A) → β
  21. Angle(B, A, C) → γ
  22. Polygon(A, B, G, E) → q1, a_1, b_1, g_1, e
  23. Polygon(G, C, E) → t2, e_1, g_2, f_1
  24. Rotate(G, If[4 < c ≤ 5, ((c - 4) * π), π], E) → G'_{1}
  25. Rotate(C, If[4 < c ≤ 5, ((c - 4) * π), π], E) → F'_{2}
  26. Rotate(E, If[4 < c ≤ 5, ((c - 4) * π), π], E) → E'_{1}
  27. Polygon(G'_{1}, F'_{2}, E'_{1}) → t2', e'_{1}, g'_{1}, f'_{2}
  28. Segment(A, E) → m
  29. Segment(B, G) → n
  30. Segment(G, C) → p
  31. Segment(C, E) → q
  32. Segment(F'_{2}, E) → r
  33. Segment(E, G'_{1}) → s
  34. Segment(G'_{1}, F'_{2}) → t
  35. Segment(G, C) → h_1
  36. Segment(C, E) → i_1
  37. If(β ≟ π / 2, 5, 8) → o
  38. OrthogonalLine(B, p_1) → j_1
  39. Intersect(p_1, j_1) → H
  40. OrthogonalLine(G, g) → k_1
  41. Intersect(k_1, g) → I
  42. Dilate(G, If[5 < c ≤ 6, 6 - c, 0], I) → G'_{2}
  43. Segment(G, G'_{2}) → l_1
  44. Polygon(A, I, G, G'_{1}) → q2, a_2, i_2, g_3, m_1
  45. Polygon(I, B, G) → t3, g_4, i_3, b_2
  46. Dilate(G, If[7 < c ≤ 8, 8 - c, 0], G'_{1}) → G'_{3}
  47. Vector(G, G'_{3}) → u
  48. Translate(I, u) → I'
  49. Translate(B, u) → B'
  50. Translate(G, u) → G'_{4}
  51. Polygon(I', B', G'_{4}) → t3', g'_{4}, n_1, b'
  52. Segment(G'_{3}, I') → q_1
  53. Segment(G'_{3}, B') → r_1
  54. Dilate(B, If[5 < c ≤ 6, 6 - c, 0], H) → H'
  55. Polygon(A, B, H, G'_{1}) → q3, a_3, b_3, h_2, t_1
  56. Polygon(B, H, G) → t4, g_5, b_4, h_3
  57. Translate(B, u) → B'_{1}
  58. Translate(H, u) → H'_{1}
  59. Translate(G, u) → G'_{5}
  60. Polygon(B'_{1}, H'_{1}, G'_{5}) → t4', g'_{5}, b'_{1}, h'_{1}
  61. Segment(B'_{1}, G'_{3}) → c_1
  62. Segment(B'_{1}, H'_{1}) → d_1
  63. Segment(B, H') → s_1

AI Drawing Prompt Reference

Draw a triangle ABC, then place a point C inside the triangle and connect A, B, and C to form triangle t1. Construct a perpendicular line h from point C, find the intersection C1 with the base, and find the midpoint D of C1. Construct the midpoints E and G of AB and AC, respectively. Perform a similarity transformation on C through D to get F', and connect C and F'. Then perform a similarity transformation on D through C1 to get D', and connect D and D'. Next, rotate C and F' to form a new triangle t2. Finally, connect A, B, G, and E to form a new triangle q1.
The prompt above was compiled from the original drawing commands and is for reference only.