1.

Line parallel to the mean spheroidal surface of earth is

Answer»

A level SURFACE: It is any surface parallel to the mean spheroidal surface of the earth e.g. surface of a still LAKE. Since the earth is a oblatespheroid, a level surface may be regarded as a CURVED surface, every point on which is equidistant from the center of the earth. It is NORMAL to the plumb line at all points.

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