Q. 25.0( 3 Votes )
What are the dire
As per the definition of direction cosines, the cosine values of the angles formed by the directed line with the x-axis, y-axis and z-axis.
Here we consider the directed line to be the x-axis.
So from the below figure, we can say,
α = the angle formed by the x-axis with x-axis = 0°
β = the angle formed by the x-axis with y-axis = 90°
γ = the angle formed by the x-axis with y-axis = 90°
cos α = cos 0° = 1
cos β = cos 90° = 0
cos γ = cos 90° = 0
Hence the direction cosines of x-axis are 1, 0, 0.
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