একটি রম্বসের প্রতিটি বাহুর দৈর্ঘ্য 13 সেমি এবং একটি কর্ণের দৈর্ঘ্য 24 সেমি। রম্বসটির ক্ষেত্রফল (বর্গ সেমি) কত?

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SSC CGL 2020 Tier-I Official Paper 1 (Held On : 13 Aug 2021 Shift 1)
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  1. 60
  2. 120
  3. 300
  4. 240

Answer (Detailed Solution Below)

Option 2 : 120
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Detailed Solution

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প্রদত্ত:

রম্বসের বাহু (a) = 13 সেমি

একটি কর্ণের দৈর্ঘ্য (p) = 24 সেমি

ব্যবহৃত সূত্র:

F1 Arun K 07-01-22 Savita D2

a = (p2 + q2 )1/2   ÷  2

রম্বসের ক্ষেত্রফল = 1/2 × p × q

গণনা:

ধরা যাক, রম্বসের অপর কর্ণটি = q

⇒ (242 + q2)1/2 ÷ 2 = 13

⇒ (576 + q2)1/2 = 26

⇒ 576 + q2 = (26)2

⇒ 676 - 576 = q2

⇒ q = √100 = 10

ক্ষেত্রফল = 1/2 × 24 × 10 = 120 বর্গ সেমি

∴ সঠিক উত্তরটি হল 120 বর্গ সেমি

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