# TSA of sphere is 4 pi R^2 but TEA of hemisphere is 3pi R^2 instead of 2pi R ^2 .how?

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Shwetank Mauria
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Feb 6, 2018

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Please see below.

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Total surface area of sphere is

We can divide it into two hemispheres, with each part having curved surface area

However in a hemisphere, we additionally have flat portion with area

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