两集合文氏图练习

GeoGebra 命令及参数

1. Segment((x_1, y_1), (x_1, y_2)) → e
2. Segment((x_1, y_2), (x_2, y_2)) → f
3. Segment((x_2, y_1), (x_2, y_2)) → g
4. Segment((x_2, y_1), (x_1, y_1)) → h
5. If(IsGreen1, 0, 1) → RB1
6. If(IsGreen1, 0.4, 1) → G1
7. If(IsGreen2, 0, 1) → RB2
8. If(IsGreen3, 0, 1) → RB3
9. If(IsGreen4, 0, 1) → RB4
10. If(IsGreen2, 0.4, 1) → G2
11. If(IsGreen3, 0.4, 1) → G3
12. If(IsGreen4, 0.4, 1) → G4
13. Element(problem, item, 1) → textitem
14. Length(problem) → i
15. Element(problem, item, 2) → key
16. Polygon(Corner[1], Corner[2], Corner[3], Corner[4]) → poly1, l, m, n, q
17. Corner(5) → G