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Exploring AAA Congruence

Exploring AAA Congruence
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2017-10-27 12:18
TriangleAngleGeometric Construction
In collections D.G. 4.4 & 4.5: Triangle Congruence Shortcuts
This applet is designed to help students investigate whether AAA is a valid criterion for triangle congruence. It involves concepts of triangle congruence and is constructed using GeoGebra commands such as polygon, circle, and angle. Suitable for middle school and above students learning geometric construction and triangle congruence criteria.

GeoGebra Commands & Parameters

  1. Polygon(A, B, C) → poly1, c, a, b
  2. Point(c) → D
  3. Point(b) → E
  4. Point(c) → F
  5. Point(a) → G
  6. Point(a) → H
  7. Point(b) → I
  8. Circle(A', Segment[D, A]) → d
  9. Circle(A', Segment[E, A]) → e
  10. Point(d) → K
  11. Circle(K, Segment[E, D]) → f
  12. Intersect(e, f, 2) → L
  13. Ray(A', L) → g
  14. Point(g) → C'
  15. Circle(C', Segment[I, C]) → h
  16. Circle(C', Segment[H, C]) → k
  17. Intersect(h, g, 1) → N
  18. Circle(N, Segment[H, I]) → p
  19. Intersect(k, p, 2) → O
  20. Ray(C', O) → i
  21. Ray(A', K) → j
  22. Intersect(i, j) → B'
  23. Polygon(A', C', B') → poly2, p_1, j_1, m
  24. Angle(C, A, B) → α
  25. Angle(A, B, C) → β
  26. Angle(B, C, A) → γ
  27. Angle(A', B', C') → δ
  28. Angle(B', C', A') → ε
  29. Angle(C', A', B') → ζ