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एक रेखा के x तथा y अक्षों पर कटे अन्तः खण्ड क्रमशः a तथा b है मूलबिंदु से रेखा पर डाले गये लम्ब की लम्बाई p है, तो सिद्ध कजिय की
` " "(1)/(p^(2)) =(1)/(a^(2)) +(1)/(b^(2)) `

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x तथा y अक्षों पर क्रमशः a तथा b अन्तः खण्डों वाली रेखा का समीकरण
` " "(x)/(a)+ (y)/(b) =1 " "....(i)`
मूलबिंदु (0,0) से रेखा (i ) पर डाले गये लम्ब की लम्बाई
` " "p= (|(0)/(a)+ (0)/(b) -1| )/(sqrt((1)/(a^(2)) +(1)/(b^(2))))`
` rArr " "p= (1)/(sqrt((1)/(a^(2)) +(1)/(b^(2)) ))`
`rArr" "(1)/(p^(2))= (1)/(a^(2))+ (1)/(b^(2))" "` यही सिद्ध करता था|

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