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To define **cylindrical coordinates**, we take an axis (usually
called the ** z-axis**) and a perpendicular plane, on which we
choose a ray (the

**Figure 1:** Among the possible sets (*r*,,*z*) of cylindrical coordinates for *P* are
(10,30°,5) and (10,390°,5).

*Silvio Levy
Wed Oct 4 16:41:25 PDT 1995*

This document is excerpted from the 30th Edition of the *CRC Standard Mathematical Tables and Formulas* (CRC Press). Unauthorized duplication is forbidden.