3-d

Question: If the co-ordinates of the points $A,B,C$be $(-1,\,3,\,2),\,\,(2,\,3,\,5)$ and (3, 5,–2) respectively, then $\angle A=$

1) $0{}^\circ $

2) $45{}^\circ $

3) $60{}^\circ $

4) $90{}^\circ $

Solution:

Explanation: No Explanation

System of co-ordinates Direction cosines and direction ratios Projection

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