The sum of the direction cosines of a straight line is
Answer & explanation
Correct answer: option 3
cos α = l, cos β = m, cos γ = n
sum of direction cosines cos α + cos β + cos γ
= l + m + n
which is constant.
The sum of the direction cosines of a straight line is
Correct answer: option 3
cos α = l, cos β = m, cos γ = n
sum of direction cosines cos α + cos β + cos γ
= l + m + n
which is constant.