একটি বর্গের কর্ণের দৈর্ঘ্য একক হলে ঐ বর্গের ক্ষেত্রফল কত বর্গ একক?
A. 4
B. 8
C. 12
D. 16
সঠিক উত্তরঃ
D.
16
Explanation:
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