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Triangle Angles Demo

Triangle Angles Demo
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2018-02-26 17:24
TriangleAngleGeometric Construction
This example demonstrates the sum of interior angles and properties of exterior angles in a triangle. Key math concepts include the triangle angle sum theorem and exterior angle properties. Construction involves commands like Polygon, Rotate, Segment, CircleArc, Line, Angle, AngularBisector, Intersect to draw triangles, angles, and angle bisectors. Suitable for middle school and above students learning geometry theorems and construction techniques.

GeoGebra Commands & Parameters

  1. Polygon(A, C, D, B) → vierhoek1, a, c, d, b
  2. Polygon(B, A, C, E) → vierhoek2, b_1, a_1, c_1, e
  3. Polygon(B, E, D) → driehoek1, d_1, b_2, e_1
  4. Rotate(B, (((s - 1) * 180))°, d_1) → B'
  5. Rotate(E, (((s - 1) * 180))°, d_1) → E'
  6. Rotate(D, (((s - 1) * 180))°, d_1) → D'
  7. Polygon(B', E', D') → driehoek1', d', b', e'
  8. Rotate(B, 180°, d_1) → B'_1
  9. Rotate(E, 180°, d_1) → E'_1
  10. Rotate(D, 180°, d_1) → D'_1
  11. Polygon(B'_1, E'_1, D'_1) → driehoek1'_1, d'_1, b'_1, e'_1
  12. Segment(B, E) → f
  13. Rotate(D, -90°, B) → DD
  14. CircleArc(B, DD, D) → g
  15. Segment(A, E) → h
  16. Rotate(C, -135°, E) → C'
  17. CircleArc(E, C', C, xOyPlane) → k
  18. Polygon(A, C, E) → driehoek2, e_2, a_2, c_2
  19. Rotate(A, (((s - 3) * 180))°, h) → A'
  20. Rotate(C, -180°, h) → C'_1
  21. Rotate(E, (((s - 3) * (-180)))°, h) → E'_2
  22. Polygon(A, C'_1, E) → driehoek2', p, q, t
  23. Polygon(D'_1, A, E) → driehoek3, e_3, d'_2, a_3
  24. Polygon(A, C, E, DD) → vierhoek3, i, j, l, m
  25. Line(D'_1, E) → n
  26. Angle(A, B, E) → α
  27. AngularBisector(A, B, E) → r
  28. Intersect(p, b'_1) → F
  29. Segment(F, E) → g_1
  30. Segment(DD, F) → f_1
  31. Angle(E, A, B) → β
  32. Angle(B, E, A) → γ