等边三角形面积导数：几何与微积分的结合

GeoGebra 命令及参数

1. Polygon(A, B, 3) → poly1, f, g, h_1, C
2. OrthogonalLine(A, g) → i
3. OrthogonalLine(C, f) → j
4. OrthogonalLine(B, h_1) → k
5. Intersect(i, j) → D
6. Intersect(g, i) → P
7. Intersect(f, j) → J
8. Segment(D, J) → t
9. Circle(J, h) → c
10. Intersect(i, g) → E
11. Intersect(h_1, k) → F
12. Circle(E, h) → d
13. Circle(F, h) → e
14. Intersect(d, i, 1) → G
15. Intersect(e, k, 1) → H
16. Intersect(c, j, 1) → I
17. Line(I, f) → l
18. Line(G, g) → m
19. Line(H, h_1) → n
20. Intersect(j, m) → K
21. Intersect(i, l) → L
22. Intersect(k, l) → M
23. Polygon(L, M, 3) → poly2, p, q, r, N