Math Chapter Wise The Plane And The Line (Cartesian And Vector) English MCQ UK SSSC LT 2020 Q.The acute angle between two lines, whose direction ratio are 2, 3, 6 and 1, 2, 2 is: Acos–1/(20/21) Bcos–1/(18/21) Ccos–1/(17/21) DNone of the above Show answer Correct answer: cos–1/(20/21)