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Alternate Interior Angles Theorem by MrWat@SFCC(HK)

Alternate Interior Angles Theorem by MrWat@SFCC(HK)
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2017-04-03 11:23
AngleTransformationGeometric Construction
This example illustrates the Alternate Interior Angles Theorem, which states that when two parallel lines are cut by a transversal, the alternate interior angles are equal. Key mathematical concepts include angles, straight lines, and parallel lines. The construction uses GeoGebra commands such as Point, Rotate, Angle, Line, etc. Suitable for middle school and above students to learn geometry.

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(q, u) → q'
  20. Translate(r, u) → r'
  21. Translate(t, u) → t'
  22. CircleArc(A, E, G) → c_1
  23. CircleArc(A, G, D) → f_1
  24. CircleArc(C, J, H) → h_1
  25. CircleArc(C, H, K) → p_1
  26. Vector(A, C) → v
  27. Translate(q, v) → q'_1
  28. Rotate(q'_1, (((-(i - 1)) * 180))°, C) → g
  29. Translate(r, v) → r'_1
  30. Rotate(r'_1, (((i - 1) * 180))°, C) → h