In TSA of spherical shell- why is it not needed to add 4-r-2 - 4-R-2- Why only 4-R-2 is written-

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Volume of Spherical Shell

In TSA of sph...

Question

In TSA of spherical shell, why is it not needed to add 4π(r)^2 + 4π(R)^2? Why only 4π(R)^2 is written?

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4 π r^{2}

4 π r^{2}

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36 π

A = 4 π r^{2}

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