梯形面积计算与作图示例

GeoGebra 命令及参数

1. Point(Circle[F, 2]) → G
2. Polygon(F, G, H, I, J, K) → poly2, f, g, h, i, j, k
3. Point(Circle[L, 2]) → M
4. Point(Circle[O, 1]) → P
5. Intersect(k, j) → B
6. Rotate(O, α, O) → O'
7. Rotate(P, α, O) → P'
8. Rotate(Q, α, O) → Q'
9. Polygon(O', P', Q') → poly4', q', o', p'
10. Rotate(L, (-β), B) → L'
11. Rotate(M, (-β), B) → M'
12. Rotate(N, (-β), B) → N'
13. Polygon(L', M', N') → poly3', n', l', m'
14. Intersect(m', j) → A
15. Intersect(j, l') → C