(A) 4(P2 – πd2/4)/πd
(B) (P2 – rd2/4)/rd
(C) 4P2/πd
(D) πd/4P2
(A) 4(P2 – πd2/4)/πd
(B) (P2 – rd2/4)/rd
(C) 4P2/πd
(D) πd/4P2
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