alleryr ব্যাসাৰ্ধ আৰু h উচ্চতাযুক্ত এটা লম্ব চুঙাৰ বক্ৰ পৃষ্ঠৰ কালি কোনটো সূত্ৰই দিয়ে?
Api * r^2
B2pi * r * h
Cpi * r^2 * h
D4pi * r^2
Answer & Solution
Correct answer: B. 2pi * r * h
এটা লম্ব চুঙাৰ বক্ৰ পাৰ্শ্বীয় পৃষ্ঠকালি 2 * pi * r * h ৰ দ্বাৰা পোৱা যায়।
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