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Zone method is used to develop _____________(a) prism(b) pyramid(c) cone(d) sphereThe question was asked in an internship interview.My question is based upon Development of Surfaces topic in chapter Development of Surfaces, Isometric Projections, Perspective Projections & Transformation of Projections of Civil Engineering Drawing

Answer»

Right option is (d) SPHERE

To elaborate: In this method the sphere is cut into a number of horizontal ZONES, each of which may be taken as frustum of a CONE whose apex is at the extended chords. Now, DEVELOP each zone independently by radial line method. For example to develop the zone A, as it is a frustum of a rigid circular cone with its apex o, on the vertical AXIS of the sphere. Apply radial-line method and obtain the development of the zone.



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