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表面积直观入门

表面积直观入门
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2020-04-23 01:00
立体几何几何作图
所属专题 Geometry - Areas and Volumes
①本范例演示了如何通过 GeoGebra 构建棱柱及其展开图，直观理解表面积的概念；②涉及核心数学概念包括面积计算、多边形展开、向量运算；③作图要点提炼了 Ray, Prism, Net, Sequence, Translate, Vector, Mirror 等命令，以及 LENGTH, WIDTH, HEIGHT, A, B, C, f, g, h, Filling, D, E, d, F, G, H, faceADBE, faceAECF, faceADGF, faceBDGH, faceBECH, faceCFGH, edgeAE, edgeAD, edgeBD, edgeBE, edgeCE, edgeAF, edgeDG, edgeBH, edgeCF, edgeFG, edgeGH, edgeCH, openclose, i, I, J, K, L 等对象；④适合初中及以上学生学习立体几何，理解表面积计算方法，也可用于数学教学演示。

GeoGebra 命令及参数

  1. Ray((0, 0, 0), (1, 0, 0)) → f
  2. Ray((0, 0, 0), (0, 1, 0)) → g
  3. Ray((0, 0, 0), (0, 0, 1)) → h
  4. Prism(E, A, D, B, C) → d, F, edgeAE, edgeAD, edgeBD, edgeBE, edgeCE, edgeAF, edgeDG, edgeBH, edgeCF, edgeFG, G, edgeGH, edgeCH, H, faceADBE, faceAECF, faceADGF, faceBDGH, faceBECH, faceCFGH
  5. Net(d, openclose) → i, I, R, S, T, U, V, faceIJKL, faceIJNM, faceJKPO, faceKLRQ, faceILST, J, faceMNUV, edgeIJ, edgeJK, edgeKL, edgeIL, edgeIM, edgeMN, edgeJN, edgeJO, edgeOP, K, edgeKP, edgeKQ, edgeQR, edgeLR, edgeLS, edgeST, edgeIT, edgeNU, edgeUV, edgeMV, L, M, N, O, P, Q
  6. Sequence(Segment[(i, 0, 0), (i, WIDTH, 0)], i, 1, LENGTH - 1, 1) → L_1
  7. Translate(L_1, Vector[A, F]) → L_2
  8. Sequence(Segment[(0, i + 1, 0), (LENGTH, i + 1, 0)], i, 0, WIDTH - 2) → L_3
  9. Translate(L_3, Vector[A, F]) → L_4
  10. Vector(M, V) → u
  11. Sequence((x(M) + i, y(M), z(M)), i, 1, LENGTH - 1, 1) → L_5
  12. Translate(L_5, u) → L_6
  13. Sequence(Segment[Element[L_5, i], Element[L_6, i]], i, 1, LENGTH - 1) → L_7
  14. Sequence((x(M), y(M) + (i * y(u) / WIDTH), z(M) + (i * z(u) / WIDTH)), i, 1, WIDTH - 1, 1) → L_8
  15. Vector(V, U) → v
  16. Translate(L_8, v) → L_9
  17. Sequence(Segment[Element[L_8, i], Element[L_9, i]], i, 1, WIDTH - 1) → L_{10}
  18. Vector(A, O) → w
  19. Sequence((x(A) + (i * x(w) / HEIGHT), y(A), z(A) + (i * z(w) / HEIGHT)), i, 1, HEIGHT - 1, 1) → L_{11}
  20. Vector(O, P) → l
  21. Translate(L_{11}, l) → L_{12}
  22. Sequence(Segment[Element[L_{11}, i], Element[L_{12}, i]], i, 1, HEIGHT - 1) → L_{13}
  23. Sequence((x(O), y(O) + (i * y(l) / WIDTH), z(O) + (i * z(l) / WIDTH)), i, 1, WIDTH - 1, 1) → L_{14}
  24. Translate(L_{14}, Vector[(-w)]) → L_{15}
  25. Sequence(Segment[Element[L_{14}, i], Element[L_{15}, i]], i, 1, WIDTH - 1) → L_{16}
  26. Mirror(L_{13}, k) → L_{17}
  27. Mirror(L_{16}, k) → L_{18}
  28. Vector(D, Q) → m
  29. Sequence((x(B) + (i * x(v) / LENGTH), y(B), z(B)), i, 1, LENGTH - 1, 1) → L_{19}
  30. Translate(L_{19}, m) → L_{20}
  31. Sequence(Segment[Element[L_{19}, i], Element[L_{20}, i]], i, 1, LENGTH - 1) → L_{21}
  32. Sequence((x(B), y(B) + (i * y(m) / HEIGHT), z(B) + (i * z(M) / HEIGHT)), i, 1, HEIGHT - 1, 1) → L_{22}
  33. Translate(L_{22}, v) → L_{23}
  34. Sequence(Segment[Element[L_{22}, i], Element[L_{23}, i]], i, 1, HEIGHT - 1) → L_{24}
  35. Mirror(L_{21}, n) → L_{25}
  36. Mirror(L_{24}, n) → L_{26}

AI 绘图提示语参考

绘制一个长方体及其展开图。首先，画出三条坐标轴，然后利用这些轴构造一个长方体。接着，将长方体展开成平面图形，展示其各个面。最后，通过平移、旋转等操作，将展开图中的各个面连接起来，形成一个完整的展开图。
以上提示语为根据原始绘图命令整理而来，仅供参考。