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यदि मूल बिन्दु से सरल रेखा `5x +12 y -k =0 ` पर डाले गए लम्ब की लम्बाई 2 हो , तो k का मान ज्ञात कीजिए ।

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यदि मूल बिन्दु से सरल रेखा `5x +12 y -k =0 ` पर डाले गए लम्ब की लम्बाई 2 हो , तो k का मान ज्ञात कीजिए ।
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मूल बिन्दु (0 ,0 ) से सरल रेखा `5x +12 y -k =0 ` पर डाले गये लम्ब की लम्बाई =2
`(5xx0+12xx0-k )/(sqrt(25+144))=2`
`(-k )/(sqrt(169 ))=2`
`(-k)/(13)=2`
`-k=26`
अंत :`k=-26`
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