等腰与非等腰三角形的外角

GeoGebra 命令及参数

1. Line(A, D) → a
2. Line(D, C) → b
3. Line(C, A) → c
4. Angle(A, D, C) → ADC
5. Angle(A, C, D) → ACB
6. Angle(D, A, C) → DAC
7. Point(A, Vector[(4 * UnitVector[Vector[D, A]])]) → G
8. Point(C, Vector[(4 * UnitVector[Vector[D, C]])]) → J
9. Point(D, Vector[(4 * UnitVector[Vector[C, D]])]) → F
10. Angle(G, A, C) → GAC
11. Distance(G, A) → DA
12. Angle(J, C, A) → JCA
13. Angle(F, D, A) → FDA
14. Line(D, B) → d
15. Line(B, C) → e
16. Line(A, B) → f
17. Intersect(c, d) → P
18. Angle(A, P, B) → APB
19. Angle(A, P, D) → APD
20. Angle(B, D, C) → BDC
21. Angle(D, P, C) → DPC
22. Angle(B, P, C) → BPC
23. Angle(D, B, C) → DBC