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#31329 Bangla Language & Literature বৃত্ত Level 0

একটি বৃত্তের ব্যাসার্ধ্য যদি r থেকে বৃদ্ধি করে r + n করা হয়, তবে তার ক্ষেত্রফল দ্বিগুণ হয়। r-এর মান কত?

  1. A n + √2
  2. B n/(√2 - 1)
  3. C √2(n + 1)
  4. D √2n
Answer: B - n/(√2 - 1)

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