If a line has ratios 2,1,-2 then it's direction cosines will be-
Answer & explanation
Correct answer: option 4
Direction cosines are-
2/√{(2)2 +(1)2 + (-2)2}, 1/√{(2)2 +(1)2 + (-2)2}, -2/√{(2)2 +(1)2 + (-2)2}
2/3, 1/3, -2/3
If a line has ratios 2,1,-2 then it's direction cosines will be-
Correct answer: option 4
Direction cosines are-
2/√{(2)2 +(1)2 + (-2)2}, 1/√{(2)2 +(1)2 + (-2)2}, -2/√{(2)2 +(1)2 + (-2)2}
2/3, 1/3, -2/3