কোনো বৃত্তের ব্যাসার্ধ যদি ২০% কমে, তবে উক্ত বৃত্তের ক্ষেত্রফল কত % কমবে ----
A. ১০%
B. ২০%
C. ৩৬%
D. ৪০%
সঠিক উত্তরঃ
C.
৩৬%
Explanation:
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