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Geometric Transformations: Reflection, Rotation, Enlargement & Translation

Geometric Transformations: Reflection, Rotation, Enlargement & Translation
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2015-08-17 00:56
TriangleCirclePolygonAngleVectorTransformation
This example explores four basic geometric transformations: reflection, rotation, enlargement, and translation. Using GeoGebra commands like Polygon, Dilate, Rotate, and Translate, you can create and manipulate plane figures. Key mathematical concepts include symmetry, rotation centers, scaling factors, and translation vectors. Construction involves defining transformation objects, setting parameters, and verifying changes. Suitable for middle school students learning geometric transformations or for math teaching demonstrations.

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. Point(xAxis) → E
  21. Line(F, E) → h
  22. Mirror(C, h) → C'
  23. Mirror(D, h) → D'
  24. Mirror(B, h) → B'
  25. Polygon(C', D', B') → poly1', b'_3, c'_3, d'_3
  26. Vector(A, G) → z
  27. Angle(G, A, H) → β