三角形的面积

GeoGebra 命令及参数

1. Segment(A, B) → AB
2. LineBisector(AB) → b
3. Point(b) → D
4. Point(b) → C
5. Segment(D, C) → CD
6. OrthogonalLine(A, CD) → g
7. Segment(C, A) → c
8. Segment(D, A) → d
9. Intersect(b, g) → E
10. Polygon(C, E, A) → poly1, a_1, c_1, e_1
11. Polygon(A, E, D) → poly3, d_4, a_2, e_3
12. Midpoint(C, A) → F
13. Midpoint(A, D) → H
14. Rotate(A, rotateΔ, H) → A'
15. Rotate(E, rotateΔ, H) → E'
16. Rotate(D, rotateΔ, H) → D'
17. Polygon(A', E', D') → poly3', d', a', e'
18. Rotate(C, rotateΔ, F) → C'
19. Rotate(E, rotateΔ, F) → E'_1
20. Rotate(A, rotateΔ, F) → A'_1
21. Polygon(C', E'_1, A'_1) → poly1', a'_1, c', e'_1
22. Midpoint(A, E) → J
23. Midpoint(D, C) → K
24. Angle(C, E, A) → α
25. Segment(A, E) → a
26. Segment(C, E) → i
27. Segment(D, E) → j
28. Polygon(D, C, A) → poly5, a_3, d_5, c_3
29. Midpoint(D, E) → G