F2 Savita SSC 21-8-24 D4

जैसा कि ऊपर चित्र में दिखाया गया है, दो वृत्त एक दूसरे को बाह्य रूप से स्पर्श करते हैं। केंद्र O वाले वृत्त की त्रिज्या 49 सेमी है। केंद्र A वाले वृत्त की त्रिज्या 16 सेमी है। उनकी उभयनिष्ठ स्पर्श रेखा BC की लंबाई (सेमी में) ज्ञात कीजिए।

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SSC CHSL Exam 2024 Tier-I Official Paper (Held On: 02 Jul, 2024 Shift 1)
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  1. 55
  2. 58
  3. 57
  4. 56

Answer (Detailed Solution Below)

Option 4 : 56
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दिया गया:

केंद्र O (r 1 ) वाले वृत्त की त्रिज्या = 49 सेमी.

केंद्र A (r 2 ) वाले वृत्त की त्रिज्या = 16 सेमी.

प्रयुक्त सूत्र:

उभयनिष्ठ स्पर्शरेखा की लंबाई = \(\sqrt{d^2-(r_1 -r_2)^2}\)

जहाँ, d = केंद्र के बीच की दूरी

गणना:

केंद्र के बीच की दूरी = 49 + 16 = 65

इसलिए,

उभयनिष्ठ स्पर्शरेखा की लंबाई

\(\sqrt{65^2-(49 -16)^2} \)

\(\sqrt{65^2-33^2} \)

\(\sqrt{(65+33)(65-33)}\)

\(\sqrt{98× 32} \)

\(\sqrt{98× 2×16} \)

⇒ 7 × 2 × 4 = 56 सेमी

∴ सही उत्तर विकल्प (4) है।

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