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यदि एक अर्धवृत्ताकार चाँदा की परिधि 66 सेमी. है, तो चाँदा का व्यास ज्ञात कीजिये |
`(pi=22//7)`

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मान लीजिये चाँदा की त्रिज्या r सेमी. है |
दिया है : चाँदा की परिधि = 66 सेमी.
`implies" "(1)/(2)(2 pi r)=66" "[because" अर्द्ववृत्त का परिमाप"=(1)/(2)(2pi r)]`
`implies" "pi r=66`
`implies" "(22)/(7)xxr=66`
`implies" "r=21" सेमी."`
अत: चाँदा का व्यास `=2r=(2xx21)=42` सेमी. है |

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