三角形内角和定理演示 by Steve Phelps

GeoGebra 命令及参数

1. Polygon(A, B, C) → poly1, c, a, b
2. Circle(A, 2) → d
3. Circle(C, Radius[d]) → e
4. Circle(B, Radius[d]) → f
5. Intersect(d, c, 1) → D
6. Intersect(d, b, 1) → E
7. Intersect(e, b, 1) → F
8. Intersect(e, a, 1) → G
9. Intersect(f, a, 1) → H
10. Intersect(f, c, 1) → I
11. CircleSector(A, D, E) → g
12. CircleSector(B, H, I) → h
13. CircleSector(C, F, G) → k
14. Dilate(B, If[n < 1, 1 - n, 0], C) → B'
15. Vector(B, B') → u
16. Translate(A, u) → A'
17. Translate(B, u) → B'_1
18. Translate(C, u) → C'
19. Polygon(A', B'_1, C') → poly1', c', a', b'_1
20. Translate(g, u) → g'
21. Translate(h, u) → h'
22. Translate(k, u) → k'
23. Midpoint(b) → J
24. If(n > 1, ((n - 1) * π), 3.141592653589793) → i
25. Rotate(A, (-i), J) → A'_1
26. Rotate(B, (-i), J) → B'_2
27. Rotate(C, (-i), J) → C'_1
28. Polygon(A'_1, B'_2, C'_1) → poly1'_1, c'_1, a'_1, b'_2
29. Rotate(g, (-i), J) → g'_1
30. Rotate(h, (-i), J) → h'_1
31. Rotate(k, (-i), J) → k'_1