এটা পাতল চুঙাকৃতিৰ খোলাৰ আয়তন কিহৰ সমান?
A2π × অন্তঃব্যাসাৰ্ধ × উচ্চতা × বেধ
B2π × গড় ব্যাসাৰ্ধ × উচ্চতা × বেধ
C4π × গড় ব্যাসাৰ্ধ × উচ্চতা × বেধ
Dπ × গড় ব্যাসাৰ্ধ² × উচ্চতা × বেধ
Answer & Solution
Correct answer: B. 2π × গড় ব্যাসাৰ্ধ × উচ্চতা × বেধ
খোলাটো মেলি দিলে প্ৰদত্ত উচ্চতা আৰু বেধৰ সৈতে গড় ব্যাসাৰ্ধৰ 2 pi গুণ দৈৰ্ঘ্যৰ এটা পাতল ফলক পোৱা যায়।
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