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उस सरल रेखा का समीकरण ज्ञात कीजिए जिस मूल बिंदु से डाले गए लम्ब की माप p इकाई तथा `alpha ` इस लम्ब का x अक्ष की धन दिशा से बनाया गया कोण है तथा `p=5` तथा `alpha =135^(@) `

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दिया है: ` " "p =5,alpha =135^(@) `
यें मान समीकरण ` xcos alpha + ysin alpha =p ` में रखने पर
`" "xcos 135^(@) +ysin 135^(@) =5`
`rArr " "-(x)/(sqrt(2)) +(y)/(sqrt(2)) =5`
`rArr " "x-y+5sqrt(2) =0" "` यही रेखा का अभीष्ट समीकरण है|

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