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Rotations on the Cartesian Plane

Rotations on the Cartesian Plane
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2015-09-11 15:52
PolygonAngleVectorCoordinate GeometryTransformation
This example demonstrates the process and effects of rotating polygons on the Cartesian plane. Core math concepts include transformation, coordinate geometry, vectors, and angles. It utilizes commands/objects like Polygon, Dilate, Ray, Translate, Vector, Rotate, Line, Mirror, Angle, and Point in GeoGebra. Suitable for high school students learning geometric transformations and their coordinate representations, as well as parametric equations.

GeoGebra Commands & Parameters

  1. Polygon(C, D, B) → poly1, b, c, d
  2. Dilate(C, a, A) → C'_1
  3. Dilate(D, a, A) → D'_1
  4. Dilate(B, a, A) → B'_1
  5. Polygon(C'_1, D'_1, B'_1) → poly1'_1, b', c', d'
  6. Ray(A, C) → e
  7. Ray(A, B) → f
  8. Ray(A, D) → g
  9. Translate(C, Vector[(horz, vert)]) → C'_2
  10. Translate(D, Vector[(horz, vert)]) → D'_2
  11. Translate(B, Vector[(horz, vert)]) → B'_2
  12. Polygon(C'_2, D'_2, B'_2) → poly1'_2, b'_1, c'_1, d'_1
  13. Vector(C, C'_2) → u
  14. Vector(B, B'_2) → v
  15. Vector(D, D'_2) → w
  16. Rotate(C, (-α), A) → C'_3
  17. Rotate(D, (-α), A) → D'_3
  18. Rotate(B, (-α), A) → B'_3
  19. Polygon(C'_3, D'_3, B'_3) → poly1'_3, b'_2, c'_2, d'_2
  20. Line(F, E) → h
  21. Mirror(C, h) → C'
  22. Mirror(D, h) → D'
  23. Mirror(B, h) → B'
  24. Polygon(C', D', B') → poly1', b'_3, c'_3, d'_3
  25. Vector(A, G) → z
  26. Angle(G, A, H) → β
  27. Polygon(I, J, K, L) → poly2, i, j, k_1, l
  28. Point(j) → P
  29. Polygon(M, N, O, P) → poly3, m, n, o, p