三角形内角和 by GreenMaths

GeoGebra 命令及参数

1. Point(xAxis) → B
2. Polygon(A, C, B) → poly1, b, a, c
3. Line(C, c) → d
4. Midpoint(C, A) → D
5. Midpoint(C, B) → E
6. Midpoint(A, B) → F
7. Polygon(D, A, F) → poly2, f, d_1, a_1
8. Polygon(F, E, B) → poly3, b_1, f_1, e
9. Rotate(F, α, E) → F'_1
10. Rotate(E, α, E) → E'
11. Rotate(B, α, E) → B'
12. Polygon(F'_1, E', B') → poly3', b', f'_1, e'
13. Rotate(D, -α, D) → D'
14. Rotate(A, -α, D) → A'
15. Rotate(F, -α, D) → F'
16. Polygon(D', A', F') → poly2', f', d', a'
17. Angle(B, A, C) → β
18. Angle(F', A', D') → γ
19. Angle(C, B, A) → δ
20. Angle(E', B', F'_1) → ε
21. Angle(A, C, B) → ζ
22. Point(d) → G
23. Point(d) → H
24. Point(c) → I
25. Point(c) → J
26. Vector(G, H) → u
27. Vector(I, J) → v