Teaching UP TGT Mock Test Series 2025 Mathematics Three Dimensional Geometry Direction ratios and Direction cosines
The direction cosines of the line which is perpendicular to the lines with direction ratios 1, –2,– 2 and 0, 2, 1are :
1
\(\frac{2}{3},-\frac{1}{3}, \frac{2}{3}\)
2
\(-\frac{2}{3},-\frac{1}{3}, \frac{2}{3}\)
3
\( \frac{2}{3},-\frac{1}{3},-\frac{2}{3}\)
4
\( \frac{2}{3}, \frac{1}{3}, \frac{2}{3}\)