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菱形面积计算 by hope0019

菱形面积计算 by hope0019
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2015-04-13 03:48
圆多边形几何作图
①本范例演示如何通过构造菱形的对角线来计算其面积；②涉及的核心数学概念包括菱形的性质、对角线互相垂直平分、面积公式A=1/2×d1×d2；③作图要点——使用GeoGebra命令Circle（画圆）、Intersect（交点）、Polygon（多边形）、Segment（线段）、OrthogonalLine（垂线）、Midpoint（中点）、Rotate（旋转）；④适合初中及以上学生学习几何作图和面积计算方法。

GeoGebra 命令及参数

  1. Circle(A, B) → c
  2. Circle(C, B) → d
  3. Intersect(c, d, 2) → D
  4. Polygon(A, B, C) → poly1, c_1, a, b
  5. Segment(B, D) → e
  6. Intersect(b, e) → E
  7. Polygon(A, E, D) → poly2, d_1, a_1, e_1
  8. Polygon(E, D, C) → poly3, c_2, e_2, d_2
  9. OrthogonalLine(A, b) → f
  10. OrthogonalLine(B, e) → g
  11. Intersect(f, g) → F
  12. Midpoint(c_1) → G
  13. Midpoint(e_1) → H
  14. Circle(H, D) → h
  15. Circle(G, A) → k
  16. Rotate(D, transform°, H) → D'
  17. Rotate(A, (-(transform°)), G) → A'
  18. Rotate(E, transform°, G) → E'
  19. OrthogonalLine(D', e_1) → i
  20. OrthogonalLine(A', c_1) → j
  21. Segment(F, E) → l
  22. OrthogonalLine(E', l) → m
  23. Intersect(m, l) → I
  24. Intersect(j, c_1) → J
  25. Polygon(I, D', J) → poly4, j_1, i_1, d'
  26. Intersect(i, e_1) → K
  27. Polygon(J, I, K) → poly5, k_1, j_2, i_2
  28. OrthogonalLine(C, g) → n
  29. Intersect(g, n) → L
  30. Midpoint(E, L) → M
  31. Midpoint(D, C) → N
  32. Circle(N, C) → p
  33. Circle(M, C) → q
  34. Segment(D, C) → r
  35. Rotate(D, (-(transform°)), N) → D'_1
  36. Rotate(C, transform°, M) → C'
  37. Rotate(E, (-(transform°)), M) → E'_1
  38. Segment(E, L) → s
  39. OrthogonalLine(E'_1, s) → t
  40. OrthogonalLine(D'_1, r) → b_1
  41. OrthogonalLine(C', a) → f_1
  42. Intersect(t, s) → O
  43. Intersect(f_1, a) → P
  44. Intersect(b_1, r) → Q
  45. Polygon(P, O, Q) → poly6, q_1, p_1, o