欧拉圆与费尔巴哈圆的动态构造

GeoGebra 命令及参数

1. Polygon(P_{1}, P_{2}, P_{3}) → t1, a3, a1, a2
2. Zip(Line[a, b], a, {P_{2}, P_{1}, P_{1}}, b, {P_{3}, P_{3}, P_{2}}) → lline_a
3. Zip(OrthogonalLine[a, b], a, lP, b, a_i) → lPp
4. Circle(P_{1}, P_{2}, P_{3}) → c_{out}
5. Center(c_{out}) → O_{out}
6. Zip(Intersect[a, b], a, lline_a, b, lPp) → lP_h
7. Zip(Segment[a, b], a, lP, b, lP_h) → l_h
8. Zip(Segment[a, b], a, lP, b, lP_m) → l_m
9. Zip(Line[a, b], a, lP, b, lP_h) → l_hh
10. Intersect(l_hh(1), l_hh(2)) → C_{Orth}
11. Line(Cm, C_{Orth}) → EuGerade
12. Segment(O_{out}, P_{1}) → R
13. Circle(lP_m(1), lP_m(2), lP_m(3)) → c_{9}
14. Center(c_{9}) → O_{9}
15. Intersect(lWh(1), lWh(2)) → O_{in}
16. Zip(Intersect[c_{9}, a], a, l_hh) → l1
17. Circle(O_{in}, r) → c_{in}
18. Length(Cm - O_{out}) → j
19. Length(Cm - O_{out}) → s1
20. Length(Cm - C_{Orth}) → s2