标准形式的抛物线

GeoGebra 命令及参数

1. Point(xAxis) → S_{(a,0)}
2. Line(Z, YAxis) → Directrix
3. Parabola(S_{(a,0)}, Directrix) → c
4. Point(c) → P_{(x,y)}
5. Segment(P_{(x,y)}, S_{(a,0)}) → f
6. OrthogonalLine(S_{(a,0)}, XAxis) → g
7. OrthogonalLine(P_{(x,y)}, Directrix) → h
8. Intersect(c, g) → L', L
9. Intersect(Directrix, h) → M
10. Distance(P_{(x,y)}, S_{(a,0)}) → distanceP(x,y)S
11. Distance(S_{(a,0)}, P_{(x,y)}) → distanceSP(x,y)
12. Segment(P_{(x,y)}, M) → i
13. OrthogonalLine(P_{(x,y)}, XAxis) → j
14. Intersect(XAxis, xAxis) → B
15. Intersect(j, XAxis) → N_{(x,0)}
16. Intersect(c, j) → C, P'