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Question

I take a flat plane piece of paper. I now fold this paper to get a 3-D object. For this 3-D object there is an area. What is this area called in Mathematics?


  1. Surface area

  2. 3-D Area

  3. Planar area

  4. Object Area 


Solution

The correct option is A

Surface area


Consider a plane piece of paper. It has a certain 2-D area. Now fold this piece of paper. What do I get? I get a 3-D object on folding a 2-D paper. The area of paper still remains the same. This area is now able occupy space as a 3-D object. How? The 2-D plane has now become what can be called a ‘surface’ in 3-D. The area of folded paper has now become the area of the surface. This is called ‘surface area’. 

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