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#5928 Bangla Language & Literature General Level 32347

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

  1. A <p><img src="http://sothik.com/exam/files/bcs/modeltest/10-16bcs/26.gif" alt="" /></p>
  2. B <p>n+√2</p>
  3. C <p>√2(n+1)</p>
  4. D <p>√2n</p>
Answer: A - <p><img src="http://sothik.com/exam/files/bcs/modeltest/10-16bcs/26.gif" alt="" /></p>

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