ഒരു വൃത്തത്തിന്റെ ആരം (radius) 4 മടങ്ങു വർധിപ്പിച്ചാൽ ആ വൃത്തത്തിന്റെ പരപ്പളവ് (area) എത്ര മടങ്ങു വർദ്ധിക്കും?
A16 മടങ്ങ്
B32 മടങ്ങ്
C4 മടങ്ങ്
D8 മടങ്ങ്
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