构建相似三角形：动态几何演示

GeoGebra 命令及参数

1. PointIn(e) → A
2. PointIn(e) → B
3. PointIn(e) → C
4. Polygon(A, B, C) → t1, c_1, a_1, b_1
5. Segment(B, C) → f
6. Segment(C, A) → g
7. Segment(A, B) → h
8. Polygon(F, D, E) → t2, e_1, f_1, d_1
9. InteriorAngles(t2) → α, β, γ
10. InteriorAngles(t1) → δ, ε, ζ
11. Sort({α, β, γ}) → l1
12. Sort({ε, δ, ζ}) → l2
13. Segment(E, D) → j
14. Segment(D, F) → k
15. Segment(F, E) → l
16. Sort({j, k, l}) → l3
17. Sort({f, g, h}) → l4
18. If(l1 ≟ l2 ∧ l3 ≠ l4, "✓", "X") → text1
19. If(l3 ≟ l4 ∧ l1 ≟ l2, "Triangles are similar. Yet they're also congruent.") → text2