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From Circular Motion to Graphs of Trigonometric Functions

From Circular Motion to Graphs of Trigonometric Functions
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2015-04-22 11:40
CircleFunctionTrigonometrySlider AnimationLocus
①This example dynamically demonstrates how sine, cosine, and tangent function graphs are generated from circular motion on the unit circle, linking geometric movement to function plots. ②Core mathematical concepts include definitions of trigonometric functions, the unit circle, angle-radian correspondence, and the periodicity, amplitude, and phase shifts of function graphs. ③Construction highlights: using GeoGebra commands such as Circle, Point, and Intersect to build the unit circle and moving point; OrthogonalLine, Segment, and Ray to draw perpendiculars and tangents; Angle and Function to mark angles and compute trigonometric values; and Point with Locus to trace the moving point's path, forming the function graphs. ④Suitable for high school trigonometry lessons, this serves as a classroom demonstration or self-guided exploration tool to help students understand the transition from geometric definitions to function graphs.

GeoGebra Commands & Parameters

  1. Intersect(xAxis, yAxis) → A
  2. Function(0, 1.9, 5.5) → g
  3. Point(g) → Q
  4. Point(yAxis) → B
  5. Circle(A, B) → c
  6. Point(c) → D
  7. Tangent(D, c) → e,
  8. Intersect(e, yAxis) → F
  9. Intersect(xAxis, e) → E
  10. Segment(F, E) → l
  11. Segment(E, A) → m
  12. Intersect(m, l) → O
  13. Intersect(c, xAxis, 2) → C
  14. Segment(A, C) → d
  15. OrthogonalLine(D, d) → f
  16. Intersect(f, m) → H
  17. Segment(A, H) → cosα
  18. Angle(Q, A, D) → α
  19. Segment(A, D) → b
  20. Segment(D, E) → tanα
  21. Segment(D, H) → sinα
  22. OrthogonalLine(D, sinα) → i
  23. Function(sin((2 * (x - (2 * 3.14 / 3)))), 2.09, 5.24) → sineα
  24. Intersect(sineα, h, (2.439250960476847, 0.6379515420040821)) → I
  25. Function(tan((2 * (x - (2 * 3.14 / 3)))), 2.09, 5.24) → tangentα
  26. Intersect(tangentα, h, (2.439250960476847, 0.8284261815090247)) → J
  27. Function(cos((2 * (x - (2 * 3.14 / 3)))), 2.09, 5.24) → cosineα
  28. Intersect(cosineα, h, (2.439250960476847, 0.770076509221398)) → K
  29. Segment(H, D) → j
  30. Segment(A, F) → k
  31. Intersect(j, m) → N
  32. Intersect(k, l) → P
  33. Function(1, 1.9, 5.5) → p
  34. Function(-1, 1.9, 5.5) → q
  35. Point(c) → R
  36. Segment(C, R) → a
  37. Segment(A, H) → g_1
  38. Segment(D, H) → h_1
  39. Segment(A, E) → j_1
  40. Angle(A, D, E) → β
  41. Ray(D, F) → i_1
  42. Ray(D, E) → l_1
  43. Intersect(c, a) → G, L
  44. OrthogonalLine(I, xAxis) → d_1
  45. Intersect(g, xAxis, 1) → M
  46. Intersect(g, xAxis, 1) → S
  47. Intersect(g, xAxis, 1) → T
  48. Intersect(g, d_1) → U
  49. Segment(I, U) → e_1
  50. OrthogonalLine(K, xAxis) → k_1
  51. Intersect(k_1, xAxis) → V
  52. Segment(K, V) → m_1
  53. OrthogonalLine(J, xAxis) → n_1
  54. Intersect(n_1, xAxis) → W
  55. Segment(J, W) → p_1
  56. Point(yAxis) → Z
  57. Point(yAxis) → A_1
  58. Segment(Z, A_1) → q_1
  59. Point(xAxis) → B_1
  60. Point(xAxis) → C_1
  61. Segment(B_1, C_1) → r_1
  62. OrthogonalLine(D, r_1) → c_1
  63. Intersect(g, r_1, 1) → D_1
  64. Intersect(c_1, r_1) → E_1
  65. Segment(D, E_1) → s_1
  66. Angle(D, E_1, A) → γ

AI Drawing Prompt Reference

Draw a unit circle and coordinate axes with the origin as the center. Place a moving point on the circle and draw a ray from the origin to the point. Drop perpendiculars from the moving point to the x-axis and y-axis, meeting them at points E and F respectively. Connect E and F, then draw a perpendicular from the origin to this line segment, meeting it at point O. Draw a tangent to the circle, meeting the x-axis at point C and the tangent at point D. From D, drop a perpendicular to the tangent, meeting it at point H. Draw line segments from the origin to D, H, and E, and label them sinα, cosα, and tanα respectively. Finally, plot the graphs of sinα, cosα, and tanα to show their relationship with the unit circle.
The prompt above was compiled from the original drawing commands and is for reference only.