Engineering
Mathematics
Direction Cosines and Direction Ratio
Question
Name the octants in which the following points lie: (−5,−3,−2).
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Solution
| Octants | x | y | z |
| 1st | + | + | + |
| 2nd | – | + | + |
| 3rd | – | – | – |
| 4th | + | – | + |
| 5th | + | – | – |
| 6th | – | – | – |
| 7th | – | + | – |
| 8th | + | + | – |
So (–5,–3,–2) lie in 6th octant
i.e. X'O'Y'Z.