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Point and Rotational Symmetry

Point and Rotational Symmetry
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2016-10-21 00:24
PolygonTransformationGeometric Construction
This example demonstrates point symmetry and rotational symmetry in geometric figures. It involves core math concepts like symmetry, angles, rotational transformations, and polygon construction. GeoGebra commands used include Polygon, Midpoint, Segment, Intersect, Rotate, Angle, and Point for construction. Suitable for middle school and above students to learn geometric transformations and symmetry principles.

GeoGebra Commands & Parameters

  1. Polygon(A, B, 3) → poly1, a, a_1, b, C
  2. Midpoint(a) → D
  3. Midpoint(a_1) → E
  4. Segment(A, E) → c
  5. Segment(D, C) → d
  6. Intersect(c, d) → F
  7. Rotate(A, α, F) → A'
  8. Rotate(B, α, F) → B'
  9. Rotate(C, α, F) → C'
  10. Polygon(A', B', C') → poly1', c', a', b'
  11. Polygon(G, H, I, J) → poly2, g, h, i, j
  12. Segment(G, I) → e
  13. Segment(J, H) → f
  14. Intersect(e, f) → K
  15. Rotate(G, α, K) → G'
  16. Rotate(H, α, K) → H'
  17. Rotate(I, α, K) → I'
  18. Rotate(J, α, K) → J'
  19. Polygon(G', H', I', J') → poly2', g', h', i', j'
  20. Rotate(pic1, α, L) → pic1'
  21. Polygon(M, N, 5) → poly3, m_1, n, p, q, r, O, P, Q
  22. Midpoint(p) → R
  23. Midpoint(n) → S
  24. Segment(Q, S) → s
  25. Segment(M, R) → t
  26. Intersect(t, s) → T
  27. Rotate(M, α, T) → M'
  28. Rotate(N, α, T) → N'
  29. Rotate(O, α, T) → O'
  30. Rotate(P, α, T) → P'
  31. Rotate(Q, α, T) → Q'
  32. Polygon(M', N', O', P', Q') → poly3', m', n', o', p', q'
  33. Angle(B, A, C) → β
  34. Angle(B', A', C') → γ
  35. Angle(H, G, J) → δ
  36. Angle(H', G', J') → ε
  37. Angle(N', M', Q') → ζ
  38. Angle(N, M, Q) → η
  39. Segment(T, M') → d_1
  40. Point(d_1) → V
  41. Segment(V, N') → e_1
  42. Segment(V, O') → f_1
  43. Segment(V, P') → g_1
  44. Segment(V, Q') → h_1