MathPlotAI Logo MathPlotAI

Interactive Exploration of the SAS Similarity Theorem for Triangles

Interactive Exploration of the SAS Similarity Theorem for Triangles
Loading the math board and drawing, please wait…
2019-02-19 21:03
TriangleTransformationGeometric ConstructionSlider Animation
① This GeoGebra applet allows students to meaningfully and conceptually discover the SAS (Side-Angle-Side) Similarity Theorem for triangles: if two sides of one triangle are proportional to two sides of another triangle and the included angles are equal, then the triangles are similar. ② The core mathematical concepts include triangle similarity criteria, proportional sides, included angles, and the properties of similar figures. ③ The construction uses GeoGebra commands such as Segment, Vector, Dilate, Polygon, Translate, Angle, Circle, Intersect, CircleSector, and Textfield to create dynamic triangles with a slider controlling the scale factor, showing corresponding angles and side ratios. ④ It is suitable for middle school (grades 8-9) or high school students, ideal for inquiry-based learning, classroom demonstrations, or self-paced exploration of geometric similarity.

GeoGebra Commands & Parameters

  1. Segment(A, B) → a
  2. Segment(B, C) → b_2
  3. Segment(C, A) → b
  4. Vector(A, D) → u
  5. Dilate(A, k, A) → A'
  6. Dilate(B, k, A) → B'
  7. Segment(A', B') → a'_2
  8. Dilate(C, k, A) → C'
  9. Dilate(A, k, A) → A'_1
  10. Segment(C', A'_1) → c'
  11. Dilate(B, k, A) → B'_1
  12. Dilate(C, k, A) → C'_1
  13. Segment(B'_1, C'_1) → b'_2
  14. Polygon(A'_1, B'_1, C'_1) → poly1, c'_1, a'_1, b'_1
  15. Dilate(A, m, D) → A'_2
  16. Vector(A, A'_2) → v
  17. Translate(A'_1, v) → E
  18. Translate(B'_1, v) → F
  19. Translate(C'_1, v) → G
  20. Polygon(E, F, G) → poly1', g, e, f
  21. Polygon(A, C, B) → poly2, b_1, a_1, c_1
  22. Segment(F, A'_2) → a'
  23. Segment(A'_2, G) → b'
  24. Segment(G, F) → i
  25. Angle(B, A, C) → α
  26. Vector(D, A) → w
  27. Circle(A, 0.5) → p
  28. Intersect(p, a) → H,
  29. Intersect(p, b) → I,
  30. Circle(A'_2, 0.5) → q
  31. Intersect(q, a', 1) → J
  32. Intersect(q, b', 1) → K
  33. CircleSector(A'_2, J, K) → r
  34. CircleSector(A, H, I) → s
  35. Angle(H, A, I) → β
  36. CircleSector(A, I, H) → t
  37. CircleSector(A'_2, K, J) → d_1
  38. Circle(B, 0.5) → c
  39. Circle(F, 0.5) → d
  40. Intersect(c, b_2, 1) → L
  41. Intersect(c, a, 1) → M
  42. Intersect(d, i, 1) → N
  43. Intersect(d, a', 1) → O
  44. CircleSector(F, N, O) → h
  45. CircleSector(B, L, M) → e_1
  46. CircleSector(F, O, N) → f_1
  47. Dilate(F, 1 - j, B) → F'
  48. Vector(F, F') → l
  49. Translate(h, l) → h'
  50. Translate(f_1, l) → g_1
  51. Textfield(k) → InputBox1

AI Drawing Prompt Reference

Draw two triangles where one is a scaled version of the other by a factor controlled by a slider, maintaining equal included angles, and display the ratios of corresponding sides and the measures of angles to explore the SAS similarity theorem.
The prompt above was compiled from the original drawing commands and is for reference only.