आकृति में, एक वृत्त की जीवा AB और CD एक-दूसरे को बाह्य रूप से बिंदु P पर प्रतिच्छेद करते हैं। यदि AB = 4 सेमी, CD = 11 सेमी और PD = 15 सेमी है, तो PB की लम्बाई क्या है?

F2 Shailesh Shraddha 03.12.2020 D2

This question was previously asked in
SSC CGL Tier 2 Quant Previous Paper 3 (Held On: 18 November 2020)
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  1. 10 सेमी
  2. 12 सेमी
  3. 8 सेमी
  4. 14 सेमी

Answer (Detailed Solution Below)

Option 1 : 10 सेमी
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Detailed Solution

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दिया गया है: 

AB और CD एक वृत्त के दो जीवाएं हैं जो एक-दूसरे को बाह्य रूप से बिंदु P पर प्रतिच्छेद करते हैं

AB = 4 सेमी, CD = 11 सेमी और PD = 15 सेमी 

उपयोग किया गया सूत्र :

यदि दो जीवाएं AB और CD एक-दूसरे को बाह्य बिंदु P पर प्रतिच्छेद करते हैं तब,

PA × PB = PC × PD 

गणना :

F3 Savita SSC 12-5-22 D1

माना PA की लम्बाई 'x' है।

PC = PD - CD

⇒ 15 - 11

⇒ PC = 4 सेमी

प्रश्न के अनुसार

PA × PB = PC × PD 

x × (x + 4) = 4 × 15

⇒ x = 6 

PB = PA + AB 

⇒ 6 + 4 

⇒ 10 

∴ PB की लम्बाई 10 सेमी है।

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