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The three variables of the cylindrical coordinate system are

  • A.\( \rho, \phi, z \)
  • B.\( r, \theta, \phi \)
  • C.\( x, y, z \)
  • D.\( \rho, \theta, z \)

Answer: A

Correct answer: \( \rho, \phi, z \)

Cylindrical coordinates use a radial distance from the axis, an azimuthal angle round it, and a height along it - so the system is a polar plane extended in the third direction. The set \( r, \theta, \phi \) belongs to spherical coordinates, where all three are measured from the origin.

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