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Sphere Created by Revolution

Sphere Created by Revolution
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2013-06-11 01:16
VectorSolid GeometryCalculusParametric Equation
This example demonstrates the generation of a 3D sphere through the revolution of a 2D shape. Key math concepts include solids of revolution, integration, parametric equations, and vector operations. Construction highlights involve using GeoGebra commands like Vector, Polygon, and Sequence to create rotational paths and figures. Suitable for high school and above students studying solid geometry and calculus applications.

GeoGebra Commands & Parameters

  1. Vector(1.1 * d * W_x) → u
  2. Vector(1.1 * d * W_y) → v
  3. Vector(1.1 * d * W_z) → w
  4. Polygon(1.1 * d * (W_x + W_y), 1.1 * d * (-W_x + W_y), 1.1 * d * (-W_x - W_y), 1.1 * d * (W_x - W_y)) → poly1, g, h, i, j
  5. Sequence(CurveCartesian[x(r * cos(0.157 * i) * W_z + r * sin(0.157 * i) * (cos(0.157 * j) * W_x + sin(0.157 * j) * W_y)), y(r * cos(0.157 * i) * W_z + r * sin(0.157 * i) * (cos(0.157 * j) * W_x + sin(0.157 * j) * W_y)), i, 0, 20], j, 0, p) → list3
  6. Sequence(CurveCartesian[x(sqrt(r^(2) - i^(2)) * cos(0.157 * j) * W_x + sqrt(r^(2) - i^(2)) * sin(0.157 * j) * W_y + i * W_z), y(sqrt(r^(2) - i^(2)) * cos(0.157 * j) * W_x + sqrt(r^(2) - i^(2)) * sin(0.157 * j) * W_y + i * W_z), j, 0, p], i, 0, r, 1) → list1
  7. Sequence(CurveCartesian[x(sqrt(r^(2) - i^(2)) * cos(0.157 * j) * W_x + sqrt(r^(2) - i^(2)) * sin(0.157 * j) * W_y - i * W_z), y(sqrt(r^(2) - i^(2)) * cos(0.157 * j) * W_x + sqrt(r^(2) - i^(2)) * sin(0.157 * j) * W_y - i * W_z), j, 0, p], i, 0, r, 1) → list2

AI Drawing Prompt Reference

Draw a 3D sphere generated by rotating a 2D shape, showing the rotational path and the shape formed by rotation, key objects include the rotational path and the rotating shape, first create vectors representing the rotation direction, then construct a quadrilateral as the 2D shape for rotation, finally generate the 3D sphere by rotating the 2D shape, emphasizing the relationship between the rotational path and the rotating shape.
The prompt above was compiled from the original drawing commands and is for reference only.