What i s direction ratis?
Please follow the link for the detailed explanation:
https://www.meritnation.com/ask-answer/question/what-are-the-direction-ratios-and-direction-cosines-of-x-y-a/vector-algebra/6740720
https://www.meritnation.com/ask-answer/question/what-are-the-direction-ratios-and-direction-cosines-of-x-y-a/vector-algebra/6740720