Categories > 3-d > System of co-ordinates > If $\alpha ,\,\,\beta ,\,\gamma $ be the angles which a line makes with the positive direction of co-ordinate axes, then ${{\sin }^{2}}\alpha +{{\sin }^{2}}\beta +{{\sin }^{2}}\gamma =$

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Question: If $\alpha ,\,\,\beta ,\,\gamma $ be the angles which a line makes with the positive direction of co-ordinate axes, then ${{\sin }^{2}}\alpha +{{\sin }^{2}}\beta +{{\sin }^{2}}\gamma =$


1) 2
2) 1
3) 3
4) 0
Solution: Explanation: No Explanation
System of co-ordinates Direction cosines and direction ratios Projection

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