alleryएक अर्धगोलाकार गुंबद की त्रिज्या 7 cm है। इसके घुमावदार आवरण के लिए कितनी सामग्री की आवश्यकता है? π = 22/7 का प्रयोग करें।
A308 cm²
B154 cm²
C462 cm²
D616 cm²
Answer & Solution
Correct answer: A. 308 cm²
एक गोलार्ध का वक्र क्षेत्रफल 2πr² = 2 × (22/7) × 49 = 308 सेमी ².
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