Suppose the direction cosines of two lines are given by al+bm+cn=0 and fmn+gln+hlm=0 where f,g,h,a,b,c are arbitrary constants and l,m,n are direction cosines of the line. On the basis of the above information the given lines will be perpendicular if:

Suppose the direction cosines of two lines are given by al+bm+cn=0 and

1.	Suppose the direction cosines of two lines are given by al+bm+cn=0 and fmn+gln+hlm=0 where f,g,h,a,b,c are arbitrary constants and l,m,n are direction cosines of the line. On the basis of the above information the given lines will be perpendicular if:
Answer» Suppose the direction cosines of two lines are given by $a l + b m + c n = 0$ and $f m n + g l n + h l m = 0$ where $f, g, h, a, b, c$ are arbitrary constants and $l, m, n$ are direction cosines of the line. On the basis of the above information the given lines will be perpendicular if: