alleryএটা অৰ্ধগোলাকাৰ গম্বুজৰ ব্যাসাৰ্ধ 7 cm। ইয়াৰ বক্ৰ আৱৰণত কিমান সামগ্ৰীৰ প্ৰয়োজন? π = 22/7 ব্যৱহাৰ কৰক।
A308 cm²
B154 cm²
C462 cm²
D616 cm²
Answer & Solution
Correct answer: A. 308 cm²
এটা গোলাৰ্ধৰ বক্ৰ অঞ্চল হ’ল 2πr² = 2 × (22/7) × 49 = 308 চে.মি
²।
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