三角形外角定理演示 by GreenMaths

GeoGebra 命令及参数

1. Polygon(A, B, C) → P, c, a, b
2. Ray(B, C) → d
3. Midpoint(C, A) → D
4. Rotate(A, -α, D) → A'
5. Rotate(B, -α, D) → B'
6. Rotate(C, -α, D) → C'
7. Polygon(A', B', C') → P', c', a', b'
8. If(α ≟ 180°, A') → E
9. Angle(P') → β, γ, δ
10. Angle(P) → ε, ζ, η
11. Point(d) → J
12. Angle(J, C, A) → Exterior
13. Translate(A, w) → A'_1
14. Translate(B, w) → B'_1
15. Translate(C, w) → C'_2
16. Polygon(A'_1, B'_1, C'_2) → P'_1, c'_2, a'_1, b'_1
17. Angle(C'_2, B'_1, A'_1) → ι
18. Point(d) → F
19. Segment(B, F) → e