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Area of a Parallelogram Exploration

Area of a Parallelogram Exploration
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2020-03-28 02:26
PolygonAngleTransformation
This dynamic illustration demonstrates that the area of a parallelogram is equal to the area of a rectangle with the same base and height. Key mathematical concepts include parallelograms, rectangles, and similarity transformations. Using GeoGebra commands such as Line, Segment, Polygon, and Dilate, the equivalence of areas can be visually understood. Suitable for middle school and above students to learn geometric transformations and area calculations.

GeoGebra Commands & Parameters

  1. Line(A, B) → f_1
  2. Line(A, B) → b
  3. Slope(b) → m
  4. PointIn(d) → C
  5. Segment(A, B) → a
  6. Line(C, a) → f
  7. OrthogonalLine(B, f) → n
  8. Intersect(f, n) → H
  9. Segment(C, H) → l
  10. Point(l) → I
  11. OrthogonalLine(I, l) → q
  12. Intersect(q, a) → J
  13. Circle(B, Distance[A, J]) → g_1
  14. Intersect(g_1, f_1, 2) → M
  15. Segment(A, C) → e
  16. Point(f) → D
  17. Ray(C, D) → g
  18. Line(B, e) → h
  19. Intersect(h, g) → E
  20. Segment(C, E) → i
  21. Segment(B, E) → j
  22. Point(i) → F
  23. OrthogonalLine(A, i) → k
  24. Angle(B, A, C) → α
  25. Ray(C, E) → p
  26. Intersect(f, k) → G
  27. Segment(G, E) → r
  28. Point(r) → K
  29. OrthogonalLine(K, r) → s
  30. Intersect(s, a) → L
  31. Polygon(A, J, I, C) → poly1, a_1, j_1, i_1, c_1
  32. Polygon(J, B, E, I) → poly2, j_2, b_1, e_1, i_2
  33. Polygon(A, L, K, C) → poly3, a_2, l_1, k_1, c_2
  34. Polygon(L, B, E, K) → poly4, l_2, b_2, e_2, k_2
  35. Dilate(I, If[0 < o ≤ 1, 1 - o, 0], J) → I'
  36. Segment(I, I') → t
  37. Angle(J, I, E) → β
  38. Dilate(J, If[2 < o ≤ 3, 3 - o, 0], M) → J'
  39. Vector(J, J') → u
  40. Angle(B, J, I) → γ
  41. OrthogonalLine(E, b) → d_1
  42. Translate(A, u) → A'
  43. Translate(J, u) → J'_1
  44. Translate(I, u) → I'_1
  45. Translate(C, u) → C'
  46. Polygon(A', J'_1, I'_1, C') → poly1', a', j'_1, i'_1, c'
  47. Angle(I'_1, J', J) → δ
  48. Polygon(A, B, E, C) → poly5, a_3, b_3, e_3, c_3
  49. Circle(E, Distance[C, K]) → h_1
  50. Intersect(h_1, f, 2) → N
  51. Polygon(A, B, E, C) → poly6, a_4, b_4, e_4, c_4
  52. Dilate(K, If[0 < o ≤ 1, 1 - o, 0], L) → K'
  53. Segment(K, K') → m_1
  54. Angle(L, K, E) → ε
  55. Angle(B, L, K) → ζ
  56. Dilate(K, If[2 < o ≤ 3, 3 - o, 0], N) → K'_1
  57. Vector(K, K'_1) → v
  58. Translate(A, v) → A'_1
  59. Translate(L, v) → L'
  60. Translate(K, v) → K'_2
  61. Translate(C, v) → C'_1
  62. Polygon(A'_1, L', K'_2, C'_1) → poly3', a'_1, l', k'_2, c'_1
  63. Angle(K'_1, L', A) → η
  64. Segment(J'_1, I'_1) → n_1
  65. Segment(L', K'_2) → p_1