四边形最小周长

GeoGebra 命令及参数

1. Polygon(A, B, C, D) → poly00, a, b, c, d
2. LineBisector(A, B) → r1
3. LineBisector(C, B) → r2
4. LineBisector(C, D) → r3
5. LineBisector(A, D) → r4
6. Line(A, C) → e
7. Line(B, D) → f
8. Intersect(f, e) → O
9. OrthogonalLine(O, d) → g4
10. Intersect(g4, d) → S
11. OrthogonalLine(O, a) → g1
12. Intersect(g1, a) → P
13. OrthogonalLine(O, b) → g2
14. Intersect(g2, b) → Q
15. OrthogonalLine(O, c) → g3
16. Intersect(g3, c) → R
17. Polygon(P, Q, R, S) → poly0, p_1, q, r, s
18. Perimeter(poly0) → po
19. Point(a, z1) → P1
20. Point(b, z2) → Q1
21. Point(c, z3) → R1
22. Point(d, z4) → S1
23. Polygon(P1, Q1, R1, S1) → poly1, p1, q1, r1_1, s1
24. Perimeter(poly1) → p