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बिन्दुओ (8,2) तथा ( -5,3) को मिलाने वाली रेखा की बिन्दुओ (16,6) तथा (3,15) को मिलाने वाली रेखा के समांतर या लम्बवत या न समांतर न लम्बवत होने या होने की जाँच कीजिए|

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माना `A-= A (8,2) ,B-= B (-5,3) ,C-= C ( 16,6) ` तथा ` D-= D (3,15)`
अब ` " " ` रेखा AB की प्रवणता `m_1 =(2-3) /(8+ 5) =- (1)/(13) `
तथा `" " ` रेखा CD की प्रवणता ` m_2 =(6-15)/( 16-3) =(-9)/( 13) `
स्पष्टतः ` " "m_1 ne m_2 rArr AB,CD ` के समांतर नहीं है|
तथा ` " "m_ 1 ne m_2 -1 rArr AB,CD ` के लम्बवत नहीं है|
अतः `AB,CD` के न तो समांतर है और न ही लम्बवत है|

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