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यदि बिंदुओं `(-2,6) ` व ( 4,8) से होकर जाने वाली, रेखाओं ( 8,12) तथा ( x,24) से होकर जाने वाली रेखा से लम्बवत है, तब x का मान ज्ञात कीजिए|

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माना `A( -2,6) A( -2,6),B( 4,8) ,C( 8,12) ` तथा D ( x ,24 ) दिए गए बिंदु है|
अब
` " "m_ 1 =AB ` की प्रवणता ` = ( 8-6)/( 4-(-2) )= (2)/(6) =(1)/(3) `
`" "m_2 =CD` की प्रवणता ` =(24-12)/( x-8) =(12)/( x-8) `
चूँकि AB ,CD पर लम्ब है, इसलिए `m_1m_2=-1`
`rArr " "( 1)/(3) ((12)/(x-8)) =-1 " "rArr " "-x+8=4 " "rArr x=4`

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