Question

Which method of development is employed in case of cones?

(a) Parallel-line development

(b) Approximation method

(c) Triangulation development

(d) Radial-line development

This question was addressed to me in class test.

Enquiry is from Development of Surfaces in section Development & Intersection of Surfaces of Engineering Drawing

Answer 1

Correct option is (d) Radial-line development

Best explanation: Parallel-line method is employed in case of prisms and cylinders in which stretch out-line principle is used. Radial-line development is used for pyramids and cones in which the true length of the slant edge or the generator is used as a radius.