Question

What do you mean by curvature of a curved surface?

Answer 1

curvature is the amount by which a geometric object such as a surface deviates from being a flat plane, or a curve from being straight as in the case of a line, but this is defined in different ways depending on the context. 
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Answer 2

• The curvature of a curved surface is a number which tells you the extent that it is curved (the bigger the number, the more tightly curved it is).