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Alternate Interior Angles Exploration by powere

Alternate Interior Angles Exploration by powere
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2018-07-31 06:58
AngleGeometric Construction
This applet helps students discover the relationship between alternate interior angles by rotating an angle 180 degrees. Key mathematical concepts include angles, straight lines, rotation, and intersection. GeoGebra commands used include Point, Rotate, Angle, Line, Circle, Intersect, etc. Suitable for middle school and above students to learn geometric transformations.

GeoGebra Commands & Parameters

  1. Point(a) → B
  2. Rotate(B, α, A) → B'
  3. Angle(B, A, B') → β
  4. Line(A, B') → b
  5. Circle(A, 1) → e
  6. Intersect(b, d) → C
  7. Circle(C, 1) → f
  8. Intersect(e, a) → D, E
  9. Intersect(e, b) → F, G
  10. Intersect(f, b) → H, I
  11. Intersect(f, d) → J, K
  12. CircleSector(C, J, H) → k
  13. CircleSector(C, H, K) → p
  14. CircleSector(A, E, G) → q
  15. CircleSector(A, G, D) → r
  16. CircleSector(A, F, E) → t
  17. Dilate(A, If[0 < i < 1, 1 - i], C) → A'
  18. Vector(A, A') → u
  19. Translate(t, u) → t'
  20. CircleArc(A, E, G) → c_1
  21. CircleArc(A, G, D) → f_1
  22. CircleArc(C, J, H) → h_1
  23. Vector(A, C) → v
  24. Midpoint(C, A) → L
  25. Rotate(q, (((-i) * 180))°, L) → q'
  26. Rotate(A, (((-i) * 180))°, L) → A'_1
  27. Segment(L, A'_1) → g
  28. Segment(C, L) → n
  29. Segment(L, A) → s
  30. Point(b) → M
  31. Point(b) → N
  32. Ray(C, M) → a_1
  33. Ray(A, N) → b_1
  34. Rotate(E, (((-i) * 180))°, L) → E'
  35. Ray(A'_1, E') → d_1
  36. Circle(A'_1, Distance[L, A'_1]) → e_1
  37. Intersect(e_1, d_1, 1) → O
  38. Segment(A'_1, O) → g_1
  39. Rotate(r, ((i * 180))°, L) → r'_2
  40. Rotate(A, ((i * 180))°, L) → A'_2
  41. Rotate(D, ((i * 180))°, L) → D'
  42. Segment(L, A'_2) → h
  43. Circle(A'_2, L) → k_1
  44. Ray(A'_2, D') → i_1
  45. Intersect(k_1, i_1) → P,
  46. Segment(A'_2, P) → j_1