ఒక రాగి తీగ చతురస్రం రూపంలో వంగినప్పుడు 121 సెం.మీ2 వైశాల్యం కలిగి ఉంది. అదే తీగ వృత్తం రూపంలో వంగి ఉంటే, వృత్తం యొక్క వైశాల్యాన్ని కనుగొనండి. (π = 22/7 ఉపయోగించండి)

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RRB ALP Previous Paper 3 (Held On: 9 Aug 2018 Shift 3)
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  1. 154 సెం.మీ2
  2. 153 సెం.మీ2
  3. 155 సెం.మీ2
  4. 150 సెం.మీ2

Answer (Detailed Solution Below)

Option 1 : 154 సెం.మీ2
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Detailed Solution

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చతురస్రం యొక్క వైశాల్యం = 121 సెం.మీ2

చతురస్రం యొక్క భుజం ‘a’ సెం.మీ అనుకుందాం,

⇒ a= 121 సెం.మీ2

⇒ a = 11 సెం.మీ

రాగి తీగ పొడవు = చతురస్రం యొక్క చుట్టుకొలత

⇒ పొడవు = 4 × 11 = 44 సెం.మీ

రాగి తీగ పొడవు = వృత్తం యొక్క చుట్టుకొలత

⇒ 2πr = 44 సెం.మీ

⇒ 2 × 22/7 × r = 44 సెం.మీ

⇒ r = 7 సెం.మీ

వృత్తం యొక్క వైశాల్యం = πr2

∴ వైశాల్యం = 22/7 × 7 × 7 = 154 సెం.మీ2
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