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https://en.wikipedia.org/wiki/Area_of_a_circle#Onion_proof
I understand the basic concept, although it is a little difficult to visualize the thin discs close to the centre of the circle. Regarding the area of each disc, it is given in the link above as 2πrdr. Then, by means of integration, each disc is "added" and the total area of the circle obtained.
Is it valid to think of each thin disc as a rectangle of length "2πr" and height "dr"?
I understand the basic concept, although it is a little difficult to visualize the thin discs close to the centre of the circle. Regarding the area of each disc, it is given in the link above as 2πrdr. Then, by means of integration, each disc is "added" and the total area of the circle obtained.
Is it valid to think of each thin disc as a rectangle of length "2πr" and height "dr"?