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Interactive Customizable Clock with Chronometer and Alarm

Interactive Customizable Clock with Chronometer and Alarm
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2012-09-17 02:08
CircleAngleVectorSequenceGeometric Construction
This GeoGebra example demonstrates an interactive analog clock with a customizable face and frame, featuring chronometer and alarm functions for teaching time-telling to children. Core mathematical concepts include circles, angles, vectors, rotation transformations, real-number arithmetic, polygons, and conditional logic. The construction uses Circle to draw the clock face, Point and Segment to build hour, minute, and second hands, Rotate to animate hand movement, Sequence to generate tick-mark lists, Vector to control hand direction and length, Angle to annotate angles, Polygon to create dial shapes, Textfield to add text labels, and If statements to implement alarm and stopwatch conditions, with Intersect used for object intersections. Suitable for elementary and middle school mathematics education, time-reading instruction, and classroom demonstrations of geometric construction and dynamic animation.

GeoGebra Commands & Parameters

  1. Intersect(xAxis, yAxis) → A
  2. Point(xAxis) → B
  3. Circle(A, B) → c_2
  4. Circle(A, C) → d
  5. Point(yAxis) → D
  6. Sequence(Rotate[D, 30° * i, A], i, 0, 12) → list1
  7. Rotate(v, (-a)°) → v'
  8. Vector(A, E) → u
  9. Rotate(u, -a * ° / 12) → u'
  10. Point(d) → F
  11. Segment(A, F) → b
  12. Rotate(A, (-a)° * 60) → A'
  13. Rotate(F, (-a)° * 60) → F'
  14. Segment(A', F') → b'
  15. Sequence(Text[13 - i, Element[list1, i] - (0.2, 0.2)], i, 1, 12) → list2
  16. Sequence(Rotate[D', 30° * i, A], i, 0, 12) → list3
  17. Segment((0, 2.95), (0, 3.05)) → t
  18. Sequence(Rotate[t, 6° * i], i, 1, 60) → list4
  19. Angle(v', u') → α
  20. Polygon(G, H, I, J) → poly1, g_1, h_1, i_1, j_1
  21. Polygon(L, M, N, O) → poly2, l_1, m_1, n_1, o_1
  22. Textfield(h) → inputBox1
  23. Textfield(m) → inputBox2
  24. Textfield(s) → inputBox3
  25. Polygon(P, Q, R, S) → poly3, p_1, q_1, r_1, s_2
  26. Textfield(h') → inputBox4
  27. Textfield(m') → inputBox5
  28. Textfield(s') → inputBox6
  29. Polygon(T, U, V, W) → poly4, t_1, u_1, v_1, w
  30. Polygon(K, Z, A_1, B_1) → poly5, k_1, z, a_1, b_1
  31. If(h_2 < 10, 0, "") → ha
  32. If(m_2 < 10, 0, "") → ma
  33. If(s_1 < 10, 0, "") → sa
  34. If(m'' < 10, 0, "") → mb
  35. If(s'' < 10, 0, "") → sb