రాంబస్ యొక్క ఒక భుజం పొడవు 41 సెం.మీ మరియు దాని వైశాల్యం 720 సెం.మీ2. దాని కర్ణాల పొడవుల మొత్తం ఎంత?

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RRB ALP Previous Paper 6 (Held On: 13 Aug 2018 Shift 1)
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  1. 82 సెం.మీ 
  2. 90 సెం.మీ
  3. 98 సెం.మీ
  4. 80 సెం.మీ

Answer (Detailed Solution Below)

Option 3 : 98 సెం.మీ
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Detailed Solution

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రాంబస్ వైశాల్యం = 1/2 × కర్ణాల లబ్ధం 

⇒ 720 = 1/2 × కర్ణాల లబ్ధం 

⇒ కర్ణాల లబ్ధం = 1440

(రాంబస్ భుజం) = (ఒక కర్ణంలో సగం)2 + (మరొక కర్ణంలో సగం)2 

⇒  (ఒక కర్ణం)2 + (మరొక కర్ణం)2  = 41 × 41 × 4

(రెండు కర్ణాల మొత్తం)2 =  (ఒక కర్ణం)2 + (మరొక కర్ణం)2 + 2 × కర్ణాల లబ్ధం

 (రెండు కర్ణాల మొత్తం)2 = 6724 + 2880 = 9604

∴ రెండు కర్ణాల మొత్తం = 98సెం.మీ

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