B. 1386 cm² / 1386 cm²
ExplanationSurface area = 4πr² = 4 × 22/7 × 10.5² = 1386 cm².
पृष्ठीय क्षेत्रफल = 4πr² = 4 × 22/7 × 10.5² = 1386 cm²।
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