筝形的性质 by GMMDC

GeoGebra 命令及参数

1. Segment(A_1, B_1) → a
2. Circle(A_1, B_1) → c
3. Circle(B_1, A_1) → d
4. Point(d) → C_1
5. Ray(B_1, C_1) → b
6. Segment(C_1, B_1) → e
7. Segment(A_1, C_1) → f
8. OrthogonalLine(B_1, f) → g
9. Point(g) → D_1
10. Segment(D_1, C_1) → h
11. Segment(D_1, A_1) → i
12. Intersect(g, f) → E_1
13. Angle(C_1, E_1, B_1) → α
14. Segment(D_1, B_1) → j
15. Intersect(j, f) → E
16. Segment(E, A_1) → k
17. Segment(E, C_1) → l
18. Polygon(A_1, B_1, C_1) → poly1, c_1, a_1, b_1
19. Polygon(A_1, D_1, C_1) → poly2, c_2, a_2, d_1
20. Circle(B, G) → p
21. Circle(D, I) → q
22. Intersect(p, q, 2) → A
23. Intersect(p, q, 1) → C