内接等边三角形练习

GeoGebra 命令及参数

1. Circle(A_1, A) → c
2. Circle(A, C_1) → d
3. Intersect(c, d, 2) → B
4. Circle(B, A) → e
5. Intersect(d, e, 1) → C
6. Intersect(d, e, 2) → D
7. Line(C, B) → a
8. Intersect(c, a, 2) → E
9. Line(B, D) → b
10. Intersect(c, b, 2) → F
11. Segment(E, F) → f
12. Segment(F, A) → g
13. Segment(E, A) → h
14. Segment(B, A) → i
15. Segment(D, A) → j
16. Polygon(E, B, A) → poly1, a_1, e_1, b_1
17. Polygon(F, D, A) → poly2, a_2, f_1, d_1
18. Angle(A, B, E) → α
19. Angle(A, D, F) → β
20. Angle(D, F, A) → γ
21. Angle(B, E, A) → δ