একটি বৃত্তে অন্তর্নিহিত, একটি বর্গক্ষেত্র এবং একটি সুষম ষড়ভুজের ক্ষেত্রফলের অনুপাত কত?

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RRB ALP Previous Paper 7 (Held On: 13 Aug 2018 Shift 2)
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  1. 2 : 3
  2. 3√3 : 2
  3. 1 : √3
  4. 4 : 3√3

Answer (Detailed Solution Below)

Option 4 : 4 : 3√3
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Detailed Solution

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উপরের রেখাচিত্রে, বৃত্তের ব্যাস হল বর্গক্ষেত্রের কর্ণের দৈর্ঘ্যের সমান।

⇒ √2a = 2r

⇒ a = √2r

⇒ বর্গক্ষেত্রের ক্ষেত্রফল = a2 = (√2r)2 = 2r2

উপরের চিত্রে, বৃত্তের ব্যাসার্ধ হল ষড়ভুজের বাহুর দৈর্ঘ্যের সমান।

ষড়ভুজটি 6টি সমবাহু ত্রিভুজ নিয়ে গঠিত,

⇒ ষড়ভুজের ক্ষেত্রফল = 6 × √3/4 × a2 = 6 × √3/4 × r2

∴ একটি বর্গক্ষেত্র এবং ষড়ভুজের ক্ষেত্রফলের অনুপাত = 2r: 6 × √3/4 × r2 = 4 : 3√3

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