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GeoGebra AR: Building Solids with Various Cross Sections via Prism Stacking

GeoGebra AR: Building Solids with Various Cross Sections via Prism Stacking
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2018-10-23 04:41
PolygonSolid GeometryIntegralGeometric ConstructionSlider Animation
In collections GeoGebra 3D & AR: PreCalc & Calculus Resources Cross Sectional Specials (Calculus)
This GeoGebra example demonstrates how to create solids with various cross-sectional shapes through prism stacking in GeoGebra Augmented Reality and 3D Graphing Calculator. Core mathematical concepts include: definite integrals for volume calculation, cross-section properties of planes and solids, and spatial geometry construction. Construction highlights: Using GeoGebra 3D commands including Plane, Polygon, Segment, Sequence, Sphere, Intersect, Midpoint to build dynamic and modifiable solid models, with sliders controlling parameters like n, s, b, a for parametric adjustment. Suitable for higher mathematics (applications of definite integrals), solid geometry teaching, and AR-enhanced mathematics education, demonstrating the relationship between cross-sectional area changes and volume.

GeoGebra Commands & Parameters

  1. Plane((0, 0, 0), (0, 1, 0), (0, 1, 1)) → s
  2. Plane((a, 0, 0), (a, 1, 1), (a, 1, 2)) → c
  3. Plane((b, 0, 0), (b, 1, 1), (b, 1, 2)) → d
  4. Segment((a, f(a)), (a, g(a))) → h
  5. Segment((b, f(b)), (b, g(b))) → i
  6. Intersect(f, h) → A
  7. Intersect(g, h, (-8, -6.968074739870145)) → B
  8. Intersect(f, i) → C
  9. Intersect(g, i, (8, -1.0319252601298547)) → D
  10. Polygon(A, B, (x(B), y(B), h), (x(A), y(A), h)) → q1, a_1, b_1, t, f_1
  11. Polygon(A, B, (a, (0.5 * (y(A) + y(B))), (sqrt(3) * h / 2))) → t1, g_1, a_2, b_2
  12. Midpoint(A, B) → E
  13. Sphere(E, A) → u
  14. Sequence(Polygon[(a + (i * deltax), g(a + (i * deltax)), 0), (a + (i * deltax), f(a + (i * deltax)), 0), 4, s], i, 0, n - 1, 1) → L3
  15. Polygon(A, B, (x(B), y(B), h)) → t2, k, a_3, b_3
  16. Sequence(Polygon[(a + (i * deltax), g(a + (i * deltax)), 0), (a + (i * deltax), f(a + (i * deltax)), 0), 3, s], i, 0, n - 1, 1) → L4
  17. Sequence(Polygon[(a + (i * deltax), f(a + (i * deltax)), 0), (a + (i * deltax), g(a + (i * deltax)), 0), (a + (i * deltax), g(a + (i * deltax)), Distance[(a + (i * deltax), f(a + (i * deltax)), 0), (a + (i * deltax), g(a + (i * deltax)), 0)])], i, 0, n - 1, 1) → L7
  18. Line((0, 0, 0), (1, 0, 0)) → m
  19. Line((0, 0, 0), (0, 1, 0)) → r
  20. Textfield(f) → InputBox1
  21. Textfield(g) → InputBox2
  22. Textfield(a) → InputBox3
  23. Textfield(b) → InputBox4
  24. Textfield(n) → InputBox5
  25. Sequence(Prism[Element[L3, i], deltax], i, 1, n, 1) → L2
  26. Sequence(Prism[Element[L4, i], deltax], i, 1, n, 1) → L5
  27. Sequence(Polygon[(a + (i * deltax), g(a + (i * deltax)), 0), (a + (i * deltax), f(a + (i * deltax)), 0), 5, s], i, 0, n - 1, 1) → L6
  28. Sequence(Prism[Element[L6, i], deltax], i, 1, n, 1) → L8
  29. Sequence(Midpoint[(a + (i * deltax), f(a + (i * deltax)), 0), (a + (i * deltax), g(a + (i * deltax)), 0)], i, 0, n - 1, 1) → L9
  30. Sequence((a + (i * deltax), f(a + (i * deltax)), 0), i, 0, n - 1, 1) → L10
  31. Sequence(Segment[Element[L9, i], Element[L10, i]], i, 1, n, 1) → radii
  32. Sequence((a + (i * deltax), g(a + (i * deltax)), 0), i, 0, n - 1, 1) → L11
  33. Sequence(Midpoint[Element[L10, i], Element[L11, i]], i, 1, n, 1) → L12
  34. Sequence(CircleArc[Element[L12, i], Element[L10, i], Element[L11, i], s], i, 1, n, 1) → L13
  35. Sequence(Prism[Element[L7, i], (-deltax)], i, 1, n, 1) → L

AI Drawing Prompt Reference

Construct a 3D solid in space by stacking a series of prisms along the x-axis between two function curves. Use sliders to adjust interval endpoints, number of segments, and cross-section shape parameters, dynamically showing how different cross-sections (rectangle, triangle, pentagon, semicircle, etc.) change along x, approximating volume via integration. Include two reference planes, segments connecting corresponding points on the curves, multiple polygon cross-sections generated from these segments, and a sequence of prisms equally spaced along x. Also display midpoints of cross-section bases, radius segments, and circular arcs to illustrate geometric relationships. The model is interactive, rotatable, and zoomable, visually demonstrating the definite integral's volume application.
The prompt above was compiled from the original drawing commands and is for reference only.