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Byju's Answer
Standard IX
Mathematics
Fifth Postulate and Playfair's Axiom
Let,a,b,c;p,q...
Question
Let,a,b,c;p,q,r;l,m,n are the d.c.of three mutually perpendicular straight lines.Prove that d.c.of a straight line which generate equal angle with these straight line will be a+p+l,b+q+m,c+r+n.
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If L, M and N are three straight lines, such that L || M and L || N, prove that M || N.