梯形的性质 by Linda Fahlberg-Stojanovska

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Segment(A, D) → c
3. Line(D, a) → c_3
4. Point(c_3) → C
5. Segment(D, C) → b
6. Segment(C, B) → d
7. Segment(A, C) → e
8. Segment(B, D) → f
9. Intersect(e, f) → E
10. Polygon(A, B, E) → poly1, e_1, a_1, b_1
11. Polygon(A, E, D) → poly2, c_1, a_2, e_2
12. Polygon(C, E, D) → poly3, c_2, d_1, e_3
13. Polygon(C, E, B) → poly4, b_2, d_2, e_4
14. Midpoint(b) → G
15. Midpoint(a) → I
16. Segment(I, G) → g
17. Segment(A, I) → h
18. Segment(I, B) → i
19. Segment(C, G) → j
20. Segment(G, D) → k