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Sphere created from Revolution by พรหมลิขิต จิตจักร

Sphere created from Revolution by พรหมลิขิต จิตจักร
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2018-11-05 12:00
FunctionSolid GeometryCalculusParametric EquationInequality
This example demonstrates the creation of a sphere through the revolution of a solid. It involves core mathematical concepts like solids of revolution, linear equations, cylinders, logarithmic functions, real numbers, and inequalities. The construction utilizes GeoGebra commands and objects such as Vector, Polygon, and Sequence. It is suitable for high school and above students studying solid geometry and calculus concepts.

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