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Alternate Interior Angles Theorem Demo (V3)

Alternate Interior Angles Theorem Demo (V3)
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2016-02-05 09:37
AngleVectorTransformationGeometric Construction
In collections Congruence (CO) Cluster Congruence (Vol 2) CCSS High School: Geometry (Congruence) Volume 2 CCSS High School: Geometry (Congruence) Volume 2 CCSS High School: Geometry (Congruence) Volume 2 Geometry (Congruence) Volume 2 CCSS High School: Geometry (Congruence) Volume 2 CCSS High School: Geometry (Congruence) Volume 2 CCSS High School: Geometry (Congruence) Volume 2 CCSS High School: Geometry (Congruence) Volume 2 CCSS High School: Geometry (Congruence) Volume 2 CCSS High School: Geometry (Congruence) Volume 2 CCSS High School: Geometry (Congruence) Volume 2 Gail LeBlancCCSS High School: Geometry (Congruence) Volume 2 CCSS High School: Geometry (Congruence) Volume 2 Parallel Lines & Related Angles Parallel Lines & Related Angles Geometry: Parallel Lines & Related Angles Angle Congruence Intros
① This example dynamically demonstrates the alternate interior angles theorem: when a transversal cuts two parallel lines, the alternate interior angles are congruent. ② Core mathematical concepts include the alternate interior angles theorem, parallel line criteria, angle measurement and congruence, and vector translation/rotation transformations. ③ Construction uses GeoGebra commands Point, Line, Rotate, Translate, Dilate, Vector, Angle, Circle, Intersect, CircleSector, and CircleArc, creating points A, B, C and applying rotations, translations, and dilations to generate the corresponding angles and auxiliary arcs. ④ Suitable for middle‑school geometry (grade 8 parallel lines and angles), high‑school analytic geometry review, and as a GeoGebra teaching demo or student exploration tool.

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. Rotate(q', (((-i) * 180))°, A') → q''
  27. Rotate(r', (((-i) * 180))°, A') → r''