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Incenter Exploration

Incenter Exploration
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2019-06-25 05:03
TriangleCircleGeometric Construction
This example demonstrates the dynamic investigation of the incircle of a triangle. Key mathematical concepts include triangles, circles, and angles. Using GeoGebra commands such as Segment, Polygon, Angle, etc., the construction of the incircle of a triangle is illustrated. Suitable for middle school and above students to learn geometric construction and properties of circles.

GeoGebra Commands & Parameters

  1. Segment(A, B) → f
  2. Slope(f) → m
  3. PointIn(b) → C
  4. Segment(B, C) → g
  5. Segment(C, A) → h
  6. Polygon(A, B, C) → poly1, c, a_1, b_1
  7. Angle(poly1) → α, β, γ
  8. Rotate(B, α / 2, A) → B'
  9. Angle(B, A, B') → δ
  10. Line(A, B') → i
  11. Intersect(g, i) → D
  12. Rotate(A, γ / 2, C) → A'
  13. Angle(A, C, A') → ε
  14. Line(C, A') → j
  15. Intersect(j, f) → E
  16. Rotate(C, β / 2, B) → C'
  17. Angle(C, B, C') → ζ
  18. Line(B, C') → k
  19. Intersect(k, h) → F
  20. Ray(C, E) → n
  21. Ray(B, F) → p
  22. Intersect(p, n) → I
  23. Angle(I, A, C) → η
  24. Angle(E, C, B) → θ
  25. Angle(F, B, A) → ι
  26. Ray(A, I) → l
  27. Line(A, C) → q
  28. Slope(q) → m_1