If a, b, c are the direction ratios of the line and l, m, n are the direction cosines of the line, then which of the fol
Posted: Wed Jul 13, 2022 8:09 pm
a) \(\frac{l}{a}=\frac{m}{b}=\frac{n}{c}=k\)
b) l2+m2+n2=1
c) k=±\(\frac{1}{\sqrt{(a^2+b^2+c^2)}}\)
d) l2-m2=n2-1
b) l2+m2+n2=1
c) k=±\(\frac{1}{\sqrt{(a^2+b^2+c^2)}}\)
d) l2-m2=n2-1