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option b is the right answer.
TSA of 1 part =(4πr^2)/4=πr^2.
TSA of 4 identical parts = 4*(πr^2)=4πr^2.
TSA of 1 part =(4πr^2)/4=πr^2.
TSA of 4 identical parts = 4*(πr^2)=4πr^2.
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