Direction of a line in 3D | 3D Geometry | Grade 12 | Math | Khan Academy

In this video, we'll look at ways to find direction ratios of a line in 3D. We first understand what they are and how they related to direction ratios. We then find the direction cosines given a set of direction ratios. We then try to find the direction cosines od a line passing through 2 given points. Finally, we try to find the direction cosines of a line making certain angles with the axes. Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! (https://www.khanacademy.org/math/ncer...) Timestamps: 0:00 Direction cosines from direction ratios 4:20 Direction cosines of a line passing through 2 points 7:34 Direction cosines of a line making certain angles with axes Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Ashish Gupta