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Which method of development is employed in case of pyramids?

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Which method of development is employed in case of pyramids?

(a) Parallel-line development

(b) Approximation method

(c) Triangulation development

(d) Radial-line development

This question was posed to me in semester exam.

Enquiry is from Development of Surfaces topic in division Development & Intersection of Surfaces of Engineering Drawing

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Right choice is (d) Radial-line development

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

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