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उस रेखा का समीकरण ज्ञात कीजिए जिसकी मूलबिंदु से लंबवत दुरी ` sqrt 8 ` मात्रक हो तथा x - अक्ष की धनात्मक दिशा एवं लम्ब के बीच ` 135^@` का कोण है |

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यहाँ ` p = sqrt8, alpha = 135^@ `
लम्ब रूप के समीकरण में ये मान रखने पर
` x cos alpha + ysin alpha = p `
` rArr x cos 135^@ + y sin 135^@ = sqrt 8 `
` rArr x ( - ( 1 ) /( sqrt 2 ) ) + y (( 1) /( sqrt 2 ) ) = sqrt 8 `
` rArr - x + y = sqrt ( 16 ) = 4 `
` rArr x - y + 4 = 0 `
जो कि अभीष्ट समीकरण है |
` (##BLJ_HIN_MAT_XI_C14_SLV_117_S01.png" width="80%">

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