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Consider an Axisymmetric problem of which is having a radius of r, rotational angle θ and length l. Then r dl dθ is known as ____

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Consider an Axisymmetric problem of which is having a radius of r, rotational angle θ and length l. Then r dl dθ is known as ____

(a) Elemental volume

(b) Element

(c) Elemental surface area

(d) Elemental surface

This question was addressed to me at a job interview.

The origin of the question is Axis Symmetric Formulation topic in division Axis Symmetric Solids Subjected to Axis Symmetric Loading of Finite Element Method

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Right answer is (c) Elemental surface area

The 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.

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