Direction Cosines and Direction ratios

Hello readers
Have a nice day!
Let’s start today a very interesting topic i.e. 3-dimensional geometry.
By this post you would be able to answer the following questions?
1. How to locate a point in space geometrically?
2. What is position vector?
3. What are direction Cosines and direction ratios?
4. How to find angle between two lines?
Are you ready?
So, go through the following notes;

Thank you

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