एका वर्तुळकंसाची लांबी 4.5π सेमी आहे आणि त्याद्वारे तयार केलेल्या क्षेत्राचे क्षेत्रफळ 27π सेमी2 आहे. तर त्या वर्तुळाचा व्यास (सेमीमध्ये) किती?

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PGCIL DT Electrical 5 May 2023 Official Paper
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  1. 12
  2. 24
  3. 9
  4. 18

Answer (Detailed Solution Below)

Option 2 : 24
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दिलेल्याप्रमाणे:

वर्तुळाच्या कमानीची लांबी 4.5π आहे.

त्याद्वारे परिक्रमा केलेल्या क्षेत्राचे क्षेत्रफळ 27π सेमी2 आहे.

वापरलेले सूत्र:

क्षेत्राचे क्षेत्रफळ = θ/360 × πr2

कंसाची लांबी = θ/360 × 2πr

गणना:

F1 Railways Savita 31-5-24 D1

प्रश्नानुसार,

⇒ 4.5π = θ/360 × 2πr 

⇒ 4.5 = θ/360 × 2r   -----------------(1)

⇒ 27π = θ/360 × πr2 

⇒ 27 = θ/360 × r2       ---------------(2)

समीकरण करणे (1) ÷ (2)

⇒ 4.5/27 = 2r/πr 2

⇒ 4.5/27 = 2/r

⇒ r = (27 × 2)/4.5

⇒ व्यास = 2r = 24

∴ योग्य उत्तर 24 आहे.

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