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Exploring SSA/ASS Congruence

Exploring SSA/ASS Congruence
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2019-11-28 00:42
TriangleTrigonometryGeometric Construction
This example demonstrates the conditions under which SSA (Side-Side-Angle) or ASS (Angle-Side-Side) can uniquely determine a triangle, involving concepts like triangle congruence, trigonometry, and geometric constructions. It uses commands like Point, Rotate, Angle, Intersect, Polygon, Segment, Ray, If in GeoGebra for construction, suitable for high school mathematics education.

GeoGebra Commands & Parameters

  1. Point(Semicircle[(x(H) - 4, y(H)), (x(H) + 4, y(H))]) → J
  2. Rotate(A, 330°, B) → A'
  3. Angle(A', B, A) → α
  4. Intersect(Circle[A, 6], Line[B, A']) → C_1, C
  5. Polygon(A, B, C) → poly1, c, a, b
  6. Point(Ray[D, (x(D) + 1, y(D))]) → E
  7. Segment(D, E) → d
  8. Point(Ray[F, (x(F) + 1, y(F))]) → G
  9. Segment(F, G) → e
  10. Angle(J, H, I) → β
  11. Rotate(P, (-γ), Q) → P'
  12. Angle(P', Q, P) → δ
  13. Point(Circle[P, d]) → R
  14. Rotate(I, (-γ), H) → I'
  15. Angle(I', H, I) → ε
  16. Segment(I, H) → g
  17. Segment(J, H) → h
  18. Ray(Q, P') → i
  19. Intersect(OrthogonalLine[R, i], i) → K
  20. Polygon(P, Q, R) → poly2, r, p, q
  21. If(Distance[R, K] < 0.01, true, false) → on