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Lines of Symmetry by Alex Kemphaus

Lines of Symmetry by Alex Kemphaus
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2017-09-18 20:11
FunctionTransformationGeometric Construction
This example demonstrates the lines of symmetry in geometric shapes. Key mathematical concepts include symmetry. Using GeoGebra commands such as Line, OrthogonalLine, and Intersect, the symmetry lines can be constructed. Suitable for middle school and above students to learn geometric transformations.

GeoGebra Commands & Parameters

  1. Line(A, B) → f
  2. Line(C, f) → g
  3. OrthogonalLine(A, f) → h
  4. OrthogonalLine(B, f) → i
  5. Intersect(g, h) → D
  6. Intersect(g, i) → E
  7. Polygon(A, B, E, D) → q1, a, b, e, d
  8. Midpoint(a) → F
  9. Midpoint(b) → G
  10. Midpoint(e) → H
  11. Midpoint(d) → I
  12. Line(I, G) → j
  13. Mirror(A, j) → A'
  14. Mirror(B, j) → B'
  15. Mirror(E, j) → E'
  16. Mirror(D, j) → D'
  17. Polygon(A', B', E', D') → q1', a', b', e', d'