基于内角的三角形性质探究

GeoGebra 命令及参数

1. Segment(D, E) → e
2. Slope(e) → Kc
3. If((Kc * (x(E) - x(D))) < 0, y - y(D) < (-1 / Kc * (x - x(D))) ∧ y - y(E) > (-1 / Kc * (x - x(E))), y - y(D) > (-1 / Kc * (x - x(D))) ∧ y - y(E) < (-1 / Kc * (x - x(E)))) → o
4. Segment(A, B) → a
5. OrthogonalLine(A, a) → b
6. Point(b) → C
7. Segment(C, B) → c
8. Segment(C, A) → d
9. Polygon(A, B, C) → poly1, c_1, a_1, b_1
10. Midpoint(D, E) → G
11. Segment(F, D) → g
12. Segment(F, E) → h
13. OrthogonalLine(D, e) → i
14. OrthogonalLine(E, e) → j
15. Angle(B, A, C) → α
16. Angle(D, F, E) → β
17. Angle(E, D, F) → γ
18. Angle(F, E, D) → δ
19. Rotate(E, 359.99°, G) → E_1
20. CircleSector(G, E, E_1) → q
21. Angle(F, D, E) → ε
22. Angle(E, F, D) → ζ
23. Angle(D, E, F) → η
24. SelectedIndex(Bahasa) → nn
25. If(nn ≟ 1, "Acute-angled triangle", "Segi tiga bersudut tirus") → text1
26. If(nn ≟ 1, "Obtuse-angled triangle", "Segi tiga bersudut cakah") → text2
27. If(nn ≟ 1, "Right-angled triangle", "Segi tiga bersudut tegak") → text3