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Similar Triangles Demo by tgay

Similar Triangles Demo by tgay
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2016-01-12 22:24
TriangleAngleTrigonometryGeometric Construction
This example demonstrates the properties and criteria of similar triangles, visually showing the relationships between corresponding angles and proportional sides through dynamic geometry. Key math concepts include similarity criteria, angle-side relationships, and trigonometric applications. Construction highlights the use of GeoGebra commands like Polygon, AngularBisector, Intersect, Angle, Circle, Segment, Point, Rotate, OrthogonalLine, Midpoint, Line, and Textfield. Suitable for high school geometry education to enhance understanding of triangle similarity.

GeoGebra Commands & Parameters

  1. Polygon(A, B, D) → poly1, c, a, b
  2. AngularBisector(c, b) → f, g
  3. AngularBisector(c, a) → d, e
  4. Intersect(e, g) → E
  5. Angle(A, B, D) → α
  6. Angle(B, A, D) → β
  7. Angle(B, D, A) → γ
  8. Circle(A', Segment[A', B']) → h
  9. Circle(D', Segment[D', B']) → k
  10. Intersect(h, k, 2) → F
  11. Polygon(B', A', F, D') → poly2, b', a', f_1, d'
  12. Segment(A', D') → i
  13. Circle(A', 3) → p
  14. Point(p) → G
  15. Segment(G, A') → j
  16. Angle(D', A', G) → Θ
  17. Rotate(B', Θ - 180°, A') → B''
  18. Rotate(A', Θ - 180°, A') → A''
  19. Rotate(F, Θ - 180°, A') → F'
  20. Rotate(D', Θ - 180°, A') → D''
  21. Polygon(B'', A'', F', D'') → poly2', b'', a'', f', d''
  22. Polygon(B'', A', D'') → poly3, d''_1, b''_1, a'_1
  23. Polygon(A', F', D'') → poly4, d''_2, a'_2, f'_1
  24. OrthogonalLine(A', b''_1) → l
  25. Point(l) → H
  26. Segment(H, A') → m
  27. Angle(D'', A', B'') → δ
  28. Angle(A', B'', D'') → ε
  29. Angle(B'', D'', A') → ζ
  30. Midpoint(d''_1) → I
  31. Midpoint(a'_1) → J
  32. Midpoint(b''_1) → K
  33. Midpoint(d''_2) → L
  34. Midpoint(a'_2) → M
  35. Angle(A', D'', F') → θ
  36. Line(A', xAxis) → b_1
  37. Intersect(p, b_1, 1) → O
  38. Angle(F', A', D'') → ι
  39. Angle(D'', F', A') → κ
  40. Textfield(scale) → inputBox1
  41. Textfield(scale) → inputBox1_1
  42. Textfield(scale) → inputBox1_2