旋转对称图形

GeoGebra 命令及参数

1. Polygon(A, B, 4) → poly1, a, b, c, d, C, D
2. Polygon(F, G, 5) → poly2, e, f, g, h, i, H, I, J
3. Midpoint(h) → K
4. Midpoint(f) → L
5. Segment(K, G) → j
6. Segment(L, J) → k
7. Intersect(j, k) → M
8. Polygon(N, O, 6) → poly3, l, S, m, n, p, q, r, P, Q, R
9. Segment(R, O) → s
10. Segment(Q, N) → t
11. Intersect(s, t) → T
12. Rotate(poly1, (-α), E) → poly1'
13. Rotate(poly2, β, M) → poly2'
14. Rotate(poly3, γ, T) → poly3'
15. Polygon(U, V, 3) → poly4, a_1, b_1, c_1, W
16. Midpoint(c_1) → Z
17. Midpoint(a_1) → A_1
18. Segment(Z, V) → d_1
19. Segment(W, A_1) → e_1
20. Intersect(d_1, e_1) → B_1
21. Rotate(poly4, δ, B_1) → poly4'