等腰梯形构造 by John Strand

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Circle(B, C) → c
3. Line(C, a) → b
4. Segment(B, C) → d
5. Circle(A, d) → e
6. Intersect(e, b, 1) → D
7. Polygon(B, C, D, A) → poly1, b_1, c_1, d_1, a_1
8. Line(E, F) → f
9. Point(f) → G
10. Mirror(G, F) → G'
11. OrthogonalLine(F, f) → g
12. Point(g) → H
13. OrthogonalLine(H, g) → h
14. Point(h) → I
15. Mirror(I, H) → I'
16. Polygon(G, G', I', I) → poly2, g_1, g', i', i