三角形的中位线与面积计算

GeoGebra 命令及参数

1. Line(A, B) → i
2. Line(B, C) → w
3. Line(C, A) → a
4. Slope(w) → m
5. Slope(i) → m_1
6. Slope(a) → m_2
7. Intersect(a, yAxis) → D
8. Intersect(i, yAxis) → E
9. Intersect(w, yAxis) → F
10. Midpoint(A, B) → G_{1}
11. Segment(C, G_{1}) → j
12. Midpoint(A, C) → H
13. Segment(B, H) → k
14. Intersect(k, j) → G
15. Segment(A, B) → p
16. Segment(B, C) → q
17. Segment(A, C) → r
18. Integral((g(x) * x), x(A), x(B)) → b
19. Integral((h(x) * x), x(B), x(C)) → o
20. Integral((f(x) * x), x(A), x(C)) → s
21. Polygon(A, B, C) → t1, c_1, a_1, b_1
22. Integral((0.5 * (g(x))^(2)), x(A), x(B)) → u
23. Integral((0.5 * (h(x))^(2)), x(B), x(C)) → v
24. Integral((0.5 * (f(x))^(2)), x(A), x(C)) → d_1