The straight lines whose direction cosines are given by \[al+bm+cn=0,fmn+gnl+hlm=0\]are perpendicular, if

\[\sqrt{\frac{a}{f}}+\sqrt{\frac{b}{g}}+\sqrt{\frac{c}{h}}=0\]

\[\frac{f}{a}+\frac{g}{b}+\frac{h}{c}=0\]

\[\sqrt{af}=\sqrt{bg}=\sqrt{ch}\]

\[\sqrt{\frac{a}{f}}=\sqrt{\frac{b}{g}}=\sqrt{\frac{c}{h}}\]

The straight lines whose direction cosines are given by \[al+bm+cn=0,f

1.	The straight lines whose direction cosines are given by \[al+bm+cn=0,fmn+gnl+hlm=0\]are perpendicular, if
A.	\[\frac{f}{a}+\frac{g}{b}+\frac{h}{c}=0\]
B.	\[\sqrt{\frac{a}{f}}+\sqrt{\frac{b}{g}}+\sqrt{\frac{c}{h}}=0\]
C.	\[\sqrt{af}=\sqrt{bg}=\sqrt{ch}\]
D.	\[\sqrt{\frac{a}{f}}=\sqrt{\frac{b}{g}}=\sqrt{\frac{c}{h}}\]
Answer» B. \[\sqrt{\frac{a}{f}}+\sqrt{\frac{b}{g}}+\sqrt{\frac{c}{h}}=0\]

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The straight lines whose direction cosines are given by \[al+bm+cn=0,fmn+gnl+hlm=0\]are perpendicular, if

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