Discussion
A point is to be located by a distance from the origin together with two angles. The system being used has the variables
Answer: B
Correct answer: \( r, \theta, \phi \)
One distance and two angles is the spherical arrangement: \( r \) from the origin, \( \theta \) measured down from the polar axis, and \( \phi \) round it. Cylindrical coordinates use two distances and one angle, and Cartesian three distances - so the count of angles identifies the system at once.
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