বৃত্তের পরিধি ও ব্যাসের অনুপাত কত?
A. ৩১: ৪
B. ২২ : ৭
C. ৪ : ৩
D. ৩ : ১৪
সঠিক উত্তরঃ
B.
২২ : ৭
Explanation:
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