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Take `pi=22/7`
किसी वृत्ताकार मैदान के चारो ओर एक चौड़ा रास्ता है। बाहरी परिधि तथा आंतरिक परिधि का अंतर 66 मीटर है। तब मार्ग की चौड़ाई ज्ञात करें?
A. 10.5 metres
B. 7 metres
C. 5.25 metres
D. 21 metres

1 Answer

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Correct Answer - A
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माना बाहरी वृत्‍त की त्रिज्या
`=R`
माना अन्तः वृत्त की त्रिज्या
`=r`
ATQ `2piR-2pir=66`
`2pi(R-r)=66`
`R-r=66/(2pi)=(66xx7)/(2xx22)=21/2`
width `=10.5m`

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