allery7 cm ব্যাসার্ধ এবং 5 cm উচ্চতা বিশিষ্ট একটি ড্রামের বক্রতলের ক্ষেত্রফল কত? (pi = 22/7)
A154 sq cm
B440 sq cm
C110 sq cm
D220 sq cm
Answer & Solution
Correct answer: D. 220 sq cm
বক্রতলের ক্ষেত্রফল হলো 2 pi r h = 2 x 22/7 x 7 x 5 = 220 square centimetres।
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