矩形与几何作图示例

GeoGebra 命令及参数

1. Segment(E, C) → a
2. OrthogonalLine(E, a) → b
3. Point(b) → R
4. OrthogonalLine(R, b) → c
5. OrthogonalLine(C, a) → d
6. Intersect(c, d) → T
7. Polygon(E, R, T, C) → poly1, a_1, c_1, d_1, b_1
8. Segment(R, C) → RC
9. Segment(T, E) → ET
10. Intersect(ET, RC) → O
11. Segment(R, O) → e
12. Segment(T, O) → f
13. Segment(O, C) → g
14. Segment(O, E) → h
15. Angle(R, O, E) → α
16. Angle(E, R, T) → β
17. Angle(R, T, C) → γ
18. Angle(T, C, E) → δ
19. Angle(C, E, R) → ε