একটি আয়াতক্ষেত্রের দৈর্ঘ্য 'a' একক এবং প্রস্থ 'b' একক হলে, কর্ণের দৈর্ঘ্য কত?
A.
B.
C.
D. ab
সঠিক উত্তরঃ
B.
Explanation:
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