B. 13 / 13
ExplanationStep 1: Standard circle form is x² + y² = r². Step 2: r² = 169 so r = 13. Step 3: Square root of right side gives the radius.
Step 1: Standard circle form x² + y² = r² है। Step 2: r² = 169 इसलिए r = 13। Step 3: Right side का square root radius देता है।
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