How to calculate the area of a pixel of an .jpeg/.png image?

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Suba Suba el 7 de Nov. de 2016

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https://es.mathworks.com/matlabcentral/answers/310938-how-to-calculate-the-area-of-a-pixel-of-an-jpeg-png-image

Editada: Suba Suba el 7 de Nov. de 2016

I already read so many questions like this,but still I couldn't derive a solution for this issue.I have attached a sample .JPEG image below, If I need to calculate the area of one pixel of this image in standard units like cm2. How can I do it? Can anybody please explain it simply because I'm new to MATLAB and don't know much technical words related to MATLAB. Please kindly help me.