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The diameter of a roller is …

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The diameter of a roller is 84cm and its length is 120 centimetre.Its take 500 complete Revolution to move once over to level the playground area of the playground in metres is
  • 1 answers

Sia ? 4 years, 9 months ago

2r = 84 cm, r = 42 cm, h = 120 cm
⇒ r = 42 cm., h = 120 cm
∴ Area of the playground leveled in taking 1 complete revolution.
{tex}2\pi rh{/tex}
= {tex}2\times{22\over7}\times42\times120{/tex}= 31680 cm2
∴ Area of the playground = 31680 × 500
= 15840000 cm2

={tex}15840000\over100\times100{/tex} m2
= 1584 m2
∴ the area of the playground is 1584 m2

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