彭罗斯风筝与箭头

GeoGebra 命令及参数

1. Point(Circle[A, 1 + (1 + sqrt(5)) / 2]) → B
2. Rotate(B, 72°, A) → BB
3. Circle(BB, 1 + 1 / (1 + 2 / (1 + sqrt(5)))) → c
4. Circle(B, 1 + 1 / (1 + 2 / (1 + sqrt(5)))) → d
5. Intersect(c, d, 1) → C
6. Polygon(A, B, C, BB) → vierhoek1, a, b, c_1, bb
7. Circle(C, 1) → e
8. Intersect(e, c_1, 1) → D
9. Intersect(e, b, 1) → E
10. CircleArc(C, D, E) → f
11. Circle(A, (1 + sqrt(5)) / 2) → g
12. Intersect(g, bb, 1) → F
13. Intersect(g, a, 1) → G
14. CircleArc(A, G, F) → h
15. Point(Circle[H, 1 + (1 + sqrt(5)) / 2]) → I
16. Rotate(I, 72°, H) → II
17. Circle(I, 1 + 2 / (1 + sqrt(5))) → k
18. Circle(II, 1 + 2 / (1 + sqrt(5))) → p
19. Intersect(k, p, 1) → J
20. Polygon(H, I, J, II) → vierhoek2, h_1, i, j, ii
21. Circle(J, 2 / (1 + sqrt(5))) → q
22. Intersect(q, i, 1) → K
23. Intersect(q, j) → L,
24. CircleArc(J, L, K) → r
25. Circle(H, 1) → s
26. Intersect(s, h_1, 1) → M
27. Intersect(s, ii, 1) → N
28. CircleArc(H, M, N) → t