1386 செமீ2 மேற்பரப்பளவு கொண்ட கோளத்தின் விட்டம் (செ.மீ. இல்) என்ன?

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RRB ALP Fitter 23 Jan 2019 Official Paper (Shift 1)
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  1. 14
  2. 21
  3. 10.5
  4. 24.5

Answer (Detailed Solution Below)

Option 2 : 21
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கொடுக்கப்பட்டவை:
 
கோளத்தின் பரப்பளவு = 1386 செ.மீ2
 
சூத்திரம்

quesImage940

கோளத்தின் மேற்பரப்பளவு = 4πR2 

கணக்கீடு∶

4πR2 = 1386

⇒ 4 × 22/7 × R2 = 1386

⇒ R2 = 441/4

⇒ R = 21/2

விட்டம் = 2r = 21 செ.மீ

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