ഒരു ഗോളത്തിന്റെ വ്യാപ്തത്തിനെ അതിന്റെ ഉപരിതല വിസ്തീർണ്ണം കൊണ്ട് ഹരിക്കുമ്പോൾ 30 എന്ന് കിട്ടുന്നുവെങ്കിൽ ഗോളത്തിന്റെ ആരം എത്ര ?
A90 cm
B9 m
C81 cm
D8 m
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