B. 9 / 9
ExplanationStep 1: Standard circle form is x² + y² = r². Step 2: r² = 81 so r = 9. Step 3: Square root of the right side is radius.
Step 1: Standard circle form x² + y² = r² है। Step 2: r² = 81 इसलिए r = 9। Step 3: Right side का square root radius होता है।
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