ഒരു ഗോളത്തിന്റെ ഉപരിതലവിസ്തീർണം 64𝛑 cm² ആണെങ്കിൽ അർധഗോളത്തിന്റെ ഉപരിതല വിസ്തീർണം എത്ര?
A48𝛑cm²
B32𝛑cm²
C30𝛑cm²
D36𝛑cm²
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