1386 സെന്റീമീറ്റർ വിസ്തീർണ്ണമുള്ള ഒരു ഗോളത്തിന്റെ വ്യാസം (സെ.മീ.) എത്രയാണ്?

This question was previously asked in
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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നൽകിയിരിക്കുന്നത്:

ഗോളത്തിന്റെ വിസ്തീർണ്ണം = 1386 cm2

സൂത്രവാക്യം∶

ഒരു ഗോളത്തിന്റെ ഉപരിതല വിസ്തീർണ്ണം = 4πR2 

കണക്കുകൂട്ടൽ∶

4πR2 = 1386

⇒ 4 × 22/7 × R2 = 1386

⇒ R2 = 441/4

⇒ R = 21/2

∴ വ്യാസം = 2r = 21 cm

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