समभुज चौकोनाच्या एका बाजूची लांबी 37 सेमी आहे आणि त्याचे क्षेत्रफळ 840 चौरस सेमी आहे. त्याच्या कर्णांच्या लांबीची बेरीज शोधा.

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RRC Group D Previous Paper 8 (Held On: 26 Sep 2018 Shift 1)
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  1. 84 सेमी
  2. 47 सेमी
  3. 42 सेमी
  4. 94 सेमी

Answer (Detailed Solution Below)

Option 4 : 94 सेमी
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Detailed Solution

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समजा P आणि Q हे समभुज चौकोनाचे कर्ण आहे,

समभुज चौकोनाचे क्षेत्रफळ = दोन्ही कर्णांचे गुणाकार/ 2,

⇒ 840 = P × Q /2,

⇒ P × Q = 1680,

पायथागोरस प्रमेय वापरून आपणास मिळते,

⇒ (P/2)2 + (Q/2)2 = 372

⇒ P2 + Q2 = 5476

परिपूर्ण चौरस सूत्र वापरून आपणास मिळते,

⇒ (P + Q)2 = P2 + 2PQ + Q2

⇒ (P + Q)2 = 5476 + 2 × 1680

⇒ P + Q = 94

म्हणून पर्याय 4 योग्य आहे.

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