Exploring the Area of a Triangle by user1917

Exploring the Area of a Triangle by user1917
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2013-02-01 06:11
This example guides students to explore how to calculate the area of a triangle using GeoGebra software. Key concepts include the formula for the area of a triangle and its application. Commands used include Line, Point, Polygon, Segment, and others. Suitable for middle school and above students learning geometric construction and area calculation.

GeoGebra Commands & Parameters

  1. Line(A_1, B_1) → a
  2. Point(a) → C
  3. OrthogonalLine(C, a) → b
  4. Point(b) → D
  5. OrthogonalLine(D, b) → c
  6. Intersect(a, xAxis) → B
  7. Intersect(c, xAxis) → A
  8. Segment(C, D) → d
  9. Point(d) → G
  10. Polygon(B, G, A) → poly1, f, e, g
  11. Midpoint(C, B) → H
  12. Midpoint(D, A) → I
  13. Segment(H, I) → h
  14. Intersect(f, h) → J
  15. Intersect(e, h) → N
  16. OrthogonalLine(G, d) → i
  17. Intersect(i, h) → L
  18. Segment(G, L) → j
  19. Polygon(J, G, L) → poly2, l, j_1, g_1
  20. Polygon(L, G, N) → poly3, k, l_1, g_2
  21. Segment(G, A) → m
  22. Polygon(B, J, N, A) → poly4, e_1, j_2, k_1, f_1
  23. Circle(M_1, 1) → p
  24. Point(p) → N_1
  25. Segment(M_1, N_1) → n
  26. Point(p) → O
  27. Segment(M_1, O) → q
  28. Angle(N_1, M_1, O) → γ
  29. Rotate(J, γ, J) → M
  30. Rotate(G, γ, J) → G'_2
  31. Rotate(L, γ, J) → L'_2
  32. Polygon(M, G'_2, L'_2) → poly2'_1, l'_2, j'_1, g'_2
  33. Circle(P, 1) → r
  34. Point(r) → Q
  35. Point(r) → R
  36. Angle(R, P, Q) → δ
  37. Segment(Q, P) → s
  38. Segment(P, R) → t
  39. Rotate(N, δ, N) → K'
  40. Rotate(L, -δ, N) → L'_1
  41. Rotate(G, -δ, N) → G'_1
  42. Rotate(N, -δ, N) → K'_1
  43. Polygon(L'_1, G'_1, K'_1) → poly3'_1, k'_1, l'_1, g'_1
  44. Polygon(J, G, L) → poly5, l_2, j_3, g_3
  45. Polygon(G, L, N) → poly6, k_2, g_4, l_3
  46. Polygon(B, C, D, A) → poly7, e_2, c_1, d_1, f_2
  47. Point(j) → S
  48. Point(h) → T
  49. Polygon(S, L, 4) → poly8, a_1, b_1, h_1, i_1, U, V
  50. Point(h) → K
  51. Polygon(G, K, M) → poly9, m_1, g_5, k_3
  52. Point(h) → Z
  53. Polygon(G, Z, N) → poly10, n_1, g_6, z

AI Drawing Prompt Reference

Draw a triangle ABC, then construct its circumcircle using the midlines and rotations to generate new triangles, ultimately forming five triangles. First, draw the three vertices A, B, and C of the triangle. Then, draw a line segment through B and C, and through C, draw a line perpendicular to it, finding its intersection with the x-axis at point D. Next, draw a line perpendicular to the original line segment through D, finding its intersection with the x-axis at point A. Construct the midlines of triangle ABC, rotate them to generate new triangles, and use these triangles to construct the circumcircle.
The prompt above was compiled from the original drawing commands and is for reference only.