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Composite Solid: Mailbox or Backpack?

Composite Solid: Mailbox or Backpack?
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2019-07-01 21:58
Solid Geometry
This example demonstrates a modifiable composite solid that can simulate the shape of a mailbox or backpack. Key mathematical concepts include volume and surface area calculations. Various GeoGebra commands are used, such as segments, rays, points, lines, orthogonal lines, intersections, vectors, translations, midpoints, spheres, circle arcs, surfaces, etc. Suitable for high school geometry and solid geometry courses.

GeoGebra Commands & Parameters

  1. Segment(B, A) → f
  2. Ray(A, C) → g
  3. Point(g) → E
  4. Line(E, D) → h
  5. OrthogonalLine(B, h, space) → i
  6. Intersect(i, h) → F
  7. Segment(B, F) → j
  8. Segment(F, E) → k
  9. Ray(A, G) → l
  10. Point(l) → H
  11. Vector(A, H) → u
  12. Translate(E, u) → E'
  13. Translate(F, u) → F'
  14. Translate(B, u) → B'
  15. Midpoint(B', H) → I
  16. Midpoint(F', E') → J
  17. Ray((0, 0, 0), (0, 0, 1)) → m
  18. Sphere(I, H) → a
  19. Intersect(m, a) → K, L
  20. Ray(D, J) → n
  21. Sphere(J, E') → b
  22. Intersect(n, b) → M, N
  23. Segment(B', B) → p
  24. Segment(B', F') → q
  25. Segment(F', F) → s
  26. Segment(E, E') → t
  27. Segment(E', F') → c
  28. Segment(A, H) → d
  29. Segment(H, E') → e
  30. Segment(H, B') → f_1
  31. CircleArc(I, H, L) → c_1
  32. Intersect(m, c_1, 1) → O
  33. CircleArc(I, O, B') → d_1
  34. CircleArc(J, E', N) → e_1
  35. Point(e_1) → P
  36. CircleArc(J, P, F') → g_1
  37. Surface(x(I) + (r * cos(u)), y(I) + v, z(I) + (r * sin(u)), u, 0, π, v, y(I), y(J)) → o
  38. CircleSector(I, H, O) → h_1
  39. CircleSector(I, O, B') → k_1
  40. Polygon(B, A, H, B') → poly1, b_1, a_1, h_2, b'
  41. Polygon(A, E, E', H) → poly2, a_2, e_2, e', h_3
  42. CircleSector(J, N, E') → q_1
  43. CircleSector(J, F', N) → p_1
  44. Polygon(E, F, F', E') → poly3, e_3, f_2, f', e'_1
  45. Polygon(B, B', F', F) → poly4, b_2, b'_1, f'_1, f_3
  46. Segment(A, E) → i_1
  47. Segment(A, E) → j_1