a) xy planes
b) yz planes
c) rz planes
d) rθ planes
Answer: c
Explanation: Axial symmetry is symmetry around an axis; an object is axially symmetric if its appearance is unchanged if rotated around an axis. Surface element may refer to an infinitesimal portion of a 2D surface, as used in a surface integral in a 3D space. Thus, the problem needs to be looked at as a two dimensional problem in rz, defined on revolving area.
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