ഒരു വൃത്തത്തിലെ ആരo 9 സെ.മീ. ആയാൽ അതിലെ ഏറ്റവും നീളം കൂടിയ ഞാണിന്റെ
നീളം എത്ര ?
A18 സെ. മീ.
B4.5 സെ.മീ,
C13.5 സെ.മീ.
D9 സെ.മീ.
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