Teaching HTET PGT Level 3 - 2024 Mock Test Mathematics Three Dimensional Geometry Angle between two lines
Find the angle between the lines whose direction ratios (2, 3, 6) and (1, 2, 2) ?
1
\({\cos ^{ - 1}}\left( {\frac{{20}}{{21}}} \right)\)
2
\({\cos ^{ - 1}}\left( {\frac{{19}}{{21}}} \right)\)
3
\({\cos ^{ - 1}}\left( {\frac{{17}}{{21}}} \right)\)
4
None of these