Question

Differentiate between—

Developable and non-developable surfaces

Answer 1

Basis	Developable Surface	Non-developable Surface
Meaning	A developable surface is one, which can be flattened, and on which, a network of latitude and longitude can be projected.	A non-developable surface is one, which cannot be flattened without shrinking, breaking or creasing.
Example	A cylinder, a cone and a plane have the property of developable surface.	A globe or spherical surface has the property of non-developable surface

On the basis of nature of developable surface, the projections are classified as cylindrical, conical and zenithal projections.