Question

Which method is used for development of a sphere?

(a) Parallel-line development

(b) Radial-line development

(c) Triangulation development

(d) Approximate method

The question was posed to me in a job interview.

This interesting question is from Development of Surfaces topic in chapter Development of Surfaces, Isometric Projections, Perspective Projections & Transformation of Projections of Civil Engineering Drawing

Answer 1

Right answer is (d) Approximate method

The best I can explain: Approximate Method: It is employed for double curved surfaces like spheres, as they are theoretically not possible to develop. The surface of the sphere is developed by approximate method. When the surface is cut by a series of cutting planes, the cut surfaces is called a zone.