ఒక శంఖువు యొక్క స్థాపన వైశాల్యం 64π సెం.మీ2, దాని ఏటవాలు ఎత్తు 17 సెం.మీ. ఘనపు గోళాన్ని పొందటానికి ఈ శంఖువును కొద్దిగా మార్చారు. ఈ గోళం యొక్క వ్యాసార్థాన్ని కనుగొనండి.

This question was previously asked in
RRB ALP CBT I 14 Aug 2018 Shift 3 Official Paper
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  1. 8∛30 సెం.మీ
  2. 2∛40 సెం.మీ
  3. 2∛30 సెం.మీ
  4. 6.5 సెం.మీ

Answer (Detailed Solution Below)

Option 3 : 2∛30 సెం.మీ
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ఉపరితల వైశాల్యం = 64π సెం.మీ2

⇒ πr= 64

⇒ ఉపరిత వ్యాసార్థం = 8 cm

⇒ శంఖువు ఎత్తు = √(289 – 64) = 15

⇒ శంఖువు ఘన పరిమాణం = πr2h/3 = (π × 8 × 8 × 15) /3 = 320π

ఘనపు గోళాన్ని పొందటానికి ఈ శంఖువును కొద్దిగా మార్చారు,

⇒ శంఖువు ఘనపరిమాణం = గోళం ఘనపరిమాణం

⇒ 320π = (4/3)π × వ్యాసార్థం3

⇒ వ్యాసార్థం = 2∛30 సెం.మీ
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