直线斜率与截距及其方程

GeoGebra 命令及参数

1. Line(A, B) → a
2. Slope(a) → m
3. Intersect(a, yAxis) → C
4. If(x(A) ≟ x(B), "yes", "no") → verticaline
5. Point(f) → D
6. Point(f) → E
7. Line(E, xAxis) → b
8. Line(D, yAxis) → d
9. Intersect(d, b) → F
10. Segment(E, F) → e
11. Segment(F, D) → g
12. Line(D, xAxis) → h
13. Line(E, yAxis) → i
14. Intersect(h, i) → G
15. Segment(G, D) → j
16. Segment(G, E) → k
17. Angle(E, F, D) → α
18. Midpoint(g) → M_{DF}
19. Midpoint(e) → M_{EF}
20. Midpoint(k) → M_{GE}
21. Midpoint(j) → M_{GD}
22. Angle(D, G, E) → β
23. Polygon(D, E, F) → poly1, f_1, d_1, e_1
24. Polygon(D, E, G) → poly2, g_1, d_2, e_2