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The nature of surface of sphere is ______________

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The nature of surface of sphere is ______________

(a) plane surface

(b) singly curved surface

(c) singly or doubly curved surface

(d) doubly curved surface

This question was posed to me in an online quiz.

I need to ask this question from Development of Surfaces topic in portion Development of Surfaces, Isometric Projections, Perspective Projections & Transformation of Projections of Civil Engineering Drawing

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Correct choice is (d) doubly curved surface

Easiest explanation: Double-curved surfaces, such as a sphere do not produce true developments, because they do not contain any straight lines.

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