alleryএকটি গোলার্ধীয় গম্বুজের ব্যাসার্ধ 7 cm। এর বাঁকা আবরণের জন্য কত উপাদানের প্রয়োজন? π = 22/7 ব্যবহার করুন।
A308 cm²
B154 cm²
C462 cm²
D616 cm²
Answer & Solution
Correct answer: A. 308 cm²
একটি গোলার্ধের বাঁকা ক্ষেত্রফল হল 2πr² = 2 × (22/7) × 49 = 308 সেমি ²।
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