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Re-Directing Descartes' 1637 Multiplication Part 1

Re-Directing Descartes' 1637 Multiplication Part 1
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2015-08-09 13:10
VectorCoordinate GeometryGeometric Construction
This example demonstrates Descartes' 1637 geometric multiplication method, illustrating the algebraic foundation through visual constructions. Core math concepts include coordinate geometry, linear regression, isosceles triangles, and geometric distribution. GeoGebra commands and objects used in construction are Intersect, Line, Point, Ray, Segment, Vector, and Circle. Suitable for high school and above students to explore the connection between geometry, algebra, and data analysis.

GeoGebra Commands & Parameters

  1. Intersect(xAxis, yAxis) → B
  2. Line(U, B) → s
  3. Point(xAxis) → A
  4. Point(xAxis) → D
  5. Ray(B, K) → l
  6. Point(s) → L
  7. Segment(B, A) → Unit
  8. Segment(B, D) → a
  9. Segment(B, C) → b
  10. Line(B, C) → c
  11. Segment(A, C) → e
  12. Line(A, e) → f
  13. Line(D, f) → g
  14. Intersect(g, c) → E
  15. Segment(B, E) → ab
  16. Segment(A, C) → i
  17. Segment(D, E) → j
  18. Segment(B, A) → h
  19. Line(B, D) → d
  20. Vector(B, D) → u
  21. Point(c) → F
  22. Point(c) → G
  23. Point(c) → H
  24. Point(d) → I
  25. Ray(B, D) → k
  26. Circle(A, L, D) → r
  27. Point(s) → T
  28. Line(T, A) → t
  29. Point(s) → J
  30. Vector(T, J) → u_1
  31. Point(t) → P
  32. Segment(P, J) → AC
  33. Line(D, AC) → n
  34. Intersect(s, n) → V
  35. Vector(T, V) → w
  36. Segment(V, D) → DE