使用圆规构造120°角

GeoGebra 命令及参数

1. Segment(O, A) → f
2. Point(f) → P
3. Circle(O, P) → e
4. If(a ≟ true, Rotate[A, 120°, O], Rotate[A, -120°, O]) → B'
5. Circle(P, O) → h
6. If(a ≟ true, Rotate[O, -40°, P], Rotate[O, 40°, P]) → C
7. If(a ≟ true, Rotate[O, (-β), P], Rotate[O, β, P]) → E
8. If(a ≟ true, Arc[h, E, C], Arc[h, C, E]) → k
9. If(a ≟ true, Rotate[P, α, O], Rotate[P, (-α), O]) → D
10. If(a ≟ true, Arc[e, P, D], Arc[e, D, P]) → c
11. Vector(O, B') → u
12. Translate(O, Vector[(b * u)]) → O'
13. Segment(O, O') → g
14. If(a ≟ true, Angle[A, O, B'], Angle[B', O, A]) → γ
15. If(a ≟ true, Rotate[P, 150°, O], Rotate[P, -150°, O]) → P'
16. If(a ≟ true, Intersect[k, c, 1], Intersect[k, c, 2]) → Q
17. Circle(Q, O) → d
18. If(a ≟ true, Rotate[O, -40°, Q], Rotate[O, 40°, Q]) → F
19. If(a ≟ true, Rotate[O, (-δ), Q], Rotate[O, δ, Q]) → G
20. If(a ≟ true, Arc[d, G, F], Arc[d, F, G]) → p
21. SelectedIndex(Bahasa) → nn
22. If(nn ≟ 1, "Animate", "Animasi") → Tex1
23. If(nn ≟ 1, "Stop", "Berhenti") → Tex2
24. If(nn ≟ 1, "Resume", "Teruskan") → Tex3
25. If(nn ≟ 1, "To construct an angle of 120° at O using a pair of compasses", "Membina sudut 120° pada O dengan menggunakan jangka lukis") → text3
26. If(nn ≟ 1, "Center O Radius OP", "Pusat O Jejari OP") → text1
27. If(nn ≟ 1, "Center P Radius OP", "Pusat P Jejari OP") → text2
28. If(nn ≟ 1, "Center Q Radius OP", "Pusat Q Jejari OP") → text4