ചുറ്റളവ് 30 സെ.മീ. ആയ ചതുരാകൃതിയിലുള്ള ഒരു കാർഡിൻ്റെ നീളത്തിൻ്റെ 2 മടങ്ങ് വീതിയുടെ 3 മടങ്ങിനോട് തുല്യമാണ്. അതിൻറെ വീതി എത്ര ?
A6 സെ.മീ.
B9 സെ.മീ.
C15 സെ.മീ.
D7 സെ.മീ.
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