x² + y² = 49 എങ്കിൽ വൃത്തത്തിന്റെ ആരം എത്ര ?
A6
B7
C14
D9
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ഒരു വൃത്തത്തിലെ ആരo 9 സെ.മീ. ആയാൽ അതിലെ ഏറ്റവും നീളം കൂടിയ ഞാണിന്റെ
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